Recommended Free Tools
Researchers at Sweden’s Defence Research Agency (FOI) have built WiFireNet, a research deep-learning system that uses Wi‑Fi channel-state information to identify people carrying concealed handguns. The early results show that radio signals contain useful detection clues, but they do not demonstrate a certified airport, stadium or checkpoint screening product.
What the Swedish team built
Erik Persson, David Gustafsson and Tomas Wilkinson at FOI described WiFireNet in an October 2026 paper titled Concealed Handgun Detection using WiFi Signals. The project includes the WiFire dataset, the trained model and source code released for further research.
As an Amazon Associate I earn from qualifying purchases.
At inference time, WiFireNet analyzes Wi‑Fi channel-state information (CSI), not camera pictures. CSI records how the radio channel changes between transmitters and receivers. A person, clothing and an object such as a handgun can alter those measurements. The researchers paired CSI recordings with aligned RGB images so that visual annotations could supervise training; the images provide labels during development rather than serving as the model’s input during detection.
Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minute“A WiFi-based security system has the potential to be a complementary modality that is able to handle occlusions or concealment and is not hindered by strict spatial configurations,” the paper’s abstract says.
#1 Best Overall
Hidden Camera Detectors,6-in-1 GPS Tracker Detector,Bug Detector,RF Detector,Listening Device Detector for Travel,Car,Hotels,Bathroom,Home,Office(Black)
- 【6-in-1 AI Smart Protection with Triple-Alert System】 Go beyond basic hidden camera and bug detectors. This smart RF signal detector scans six threats: hidden cameras, WiFi bugs, GPS trackers, WiFi signals, magnetic fields, and Bluetooth spy devices. Ideal as a camera finder for travel and a privacy scanner for home.Its triple-alert system — flashing LEDs, strong vibration, and adjustable audio — ensures no threat goes unnoticed, even in noisy environments. Includes a flexible probe for tight spots and a gain antenna for stable signals.The privacy scanner for peace of mind.
- 【Specialized for Vehicle Security: flexible probe Magnetic GPS Tracker Detector】 Built with a high-precision magnetic sensor, this GPS tracker finder and bug detector quickly locates magnetic GPS trackers, GPS locators, and spy tracking devices hidden under vehicles, behind bumpers, or in personal items. Its flexible probe reaches tight spots like wheel wells and undercarriage gaps, so no hidden tracker goes undetected. Ideal for vehicle anti-spy sweeps, car bug sweeps. An essential car tracker finder for privacy protection.
- 【Lab-Certified Accuracy, Ultra-Wide Band & Lightning-Fast Scanning】 Co-developed with security experts and rigorously tested in FCC-certified laboratories. This RF detector and signal detector covers an ultra-wide frequency range from 1MHz to 10GHz, scans up to 2,000 times per second, and detects hidden camera, GPS tracker, wireless bug, and other spy threats from as close as 2 inches to as far as 50 feet. A professional bug sweeper and anti-spy device for thorough hidden device detection.
- 【Trusted by 500K+ Users Worldwide, The Choice of Professionals】 Join a global community of over 500,000 security-conscious individuals — including security experts, frequent business travelers, and government personnel. More than just a GPS tracker detector, bug detector, or RF signal detector, it’s an industry-recognized privacy shield and anti-spy sweeper designed to keep pace with evolving surveillance tactics. Your trusted partner for bug sweeps, hidden camera detection, and GPS locator finder needs.
- 【2-Year Warranty & Dedicated Support, A Confident Investment】 Backed by a full 2-year warranty on this professional-grade device. Receive prompt assistance from our dedicated support team, with responses guaranteed within 24 hours. We are committed to delivering long-term privacy security and ensuring your complete confidence with every purchase.
Why use Wi‑Fi for concealed-weapon detection?
Cameras can miss a handgun hidden by clothing, body position or another obstruction. Metal detectors are established screening tools, but they generally require people to move through a constrained checkpoint one at a time. Wi‑Fi sensing could, in principle, monitor a less restrictive space and add information that a visible-light camera cannot provide.
That describes a potential role, not a replacement. A radio-based system would still need to distinguish a handgun from bodies, clothing, bags and ordinary objects while operating safely around people who have not appeared in its training data.
How WiFireNet works
- Collect CSI: Wi‑Fi measurements capture changes in the radio channel between transmitting and receiving equipment.
- Align supervision data: The WiFire dataset pairs those measurements with synchronized RGB images. Human or computer-generated visual annotations identify the weapon locations used as training targets.
- Train the detector: WiFireNet learns patterns in CSI associated with the annotated handgun examples.
- Evaluate localization: The model is scored by object-detection metrics that measure whether predicted weapon locations overlap the reference locations closely enough.
The released dataset, model and code are intended to let other researchers reproduce, test and improve the approach. They do not turn a Wi‑Fi access point into a ready-to-deploy security scanner.
What the reported accuracy means
The technical report gives the following object-detection results for handguns:
Rank #2
- All-in-One Detection: RT-100S 3-in-1 EMF Reader measures Electric (EF), Magnetic (MF), and Radio Frequency (RF) fields to monitor radiation in your home, office, or outdoors.EF (Electric Field): Detects radiation from appliances like microwaves, refrigerators, and power lines.MF (Magnetic Field): Measures magnetic radiation from devices like motors, microwaves, and refrigerators.RF (Radio Frequency): Monitors radiation from Wi-Fi routers, cell phones, and 5G signals.It’s also great for paranormal investigations, detecting EMF changes linked to ghostly activity.
- Easy to Use: ERICKHILL Radiation Detector ready to measure instantly upon powering on—no complicated setup required. All three field strengths display directly on the screen, letting you see electric, magnetic, and RF readings at a glance. Ideal for users of all experience levels.
- Clear Color-Coded Screen: The large display features a three-color backlight indicator (green, orange, and red) that changes based on radiation levels, giving you instant visual feedback on EMF exposure to easily assess low, moderate, and high radiation zones.
- Triple Alarm Modes: Equipped with sound, screen, and light alerts that help you identify areas with higher radiation levels, this EMF meter ensures you’re always aware of your environment. You can easily turn off the sound alerts if preferred, while the visual and light indicators will still highlight areas with higher radiation, making it ideal for both indoor and outdoor use.
- Convenient and Energy-Saving Design: Our emf detector equipped with unit switching for customized readings, a Type-C charging port for fast, easy charging, and an automatic shutoff feature to save battery, this EMF detector is portable, energy-efficient, and made for frequent use.
| Metric | Lenient localization threshold | Strict localization threshold |
|---|---|---|
| Handgun average precision | 72.5% | 53.8% |
| Mean average precision across evaluated classes | 50.3% | 47.1% |
Average precision is not the percentage of people correctly screened. It combines detection and localization behavior over confidence thresholds. The large drop from 72.5% to 53.8% when localization becomes stricter shows that finding a likely weapon and placing its predicted location accurately are different challenges.
The evaluation split signal samples into training and test sets. It did not establish performance in entirely unfamiliar rooms or in separately recorded sessions. A configuration using more pilot subcarriers performed worse overall, and the report says the reason needs further study. Those limitations make the figures useful for judging this experiment, but not for predicting false-alarm or miss rates at a public venue.
How it compares with existing screening approaches
| Approach | Clothing and occlusion | Throughput and space | Weapon specificity and false positives | Privacy | Outside-training performance | Status |
|---|---|---|---|---|---|---|
| WiFireNet-style Wi‑Fi sensing | Potentially less dependent on line of sight; demonstrated only in the reported experiments | Designed to avoid a strict one-person checkpoint, but operational throughput is not established | Handgun localization is promising but still experimental; real-world false-positive rates are unknown | Uses radio measurements rather than camera images at inference, but people’s movement and presence can still be sensitive data | Unproven in unfamiliar rooms and separately recorded sessions | Research prototype |
| Cameras | Can miss weapons hidden by clothing or occlusion | Can observe broader areas without forcing a single-file passage | Visible appearance can support object classification, but lighting, angle and concealment affect results | Records identifiable imagery unless privacy controls are applied | Depends on training data, camera placement and scene changes | Operational technology, with deployment-specific certification and policies |
| Metal detectors | Do not depend on visual visibility, but detect metal rather than weapon shape | Usually require people to pass through a constrained checkpoint one at a time | May alert on harmless metal items and generally need follow-up screening | Can be less visually intrusive than cameras, while still imposing a physical screening process | Performance depends on the detector, settings and screening procedure | Established checkpoint technology |
| Earlier wireless-sensing studies | Varies by experiment | Varies by antenna layout and test area | Results are task-specific and cannot be substituted for WiFireNet results | Varies by collected data | Often tested in limited indoor setups | Research evidence, not a common certification benchmark |
Earlier wireless results need careful interpretation
An IEEE GLOBECOM 2018 study used one transmitting antenna and two multi-antenna receivers in an indoor area of approximately 42 by 39 feet. It reported 86.44 average accuracy for distinguishing metal from non-metal cases. That was a different task, apparatus and metric from concealed-handgun localization, so the number cannot be compared directly with WiFireNet’s average precision.
The Tool Desk
Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →A 2025 Wiley paper reported 90.5% and 87.5% test-sample accuracy for metallic-plate and real-gun detection indoors at 20 feet. Its targets, room, distance and evaluation procedure also differed. These studies indicate that wireless signals can carry information about metallic objects, but they do not validate WiFireNet in a new environment.
Rank #3
- 【6-in-1 All-Round Protection】-This multifunctional detector integrates 6 core functions, beyond other basic detectors with its 6-in-1 instant alert system—combining flashing LEDs, strong vibrations, and adjustable audio beeps to ensure no hidden threat goes unnoticed. Unlike conventional devices that rely solely on sound, this AI-powered anti-spy tool provides multiple, unmistakable warnings, making it ideal for noisy environments like hotels or discreet sweeps in public spaces. Perfect for scanning hotels, offices, vehicles, and changing rooms, it eliminates risks from spy cams, trackers, and bugs. covering multi-scenario privacy and protection needs，Never Miss a Hidden Threat；
- [Powerful Detection Capability] - The hidden camera detector covers 1MHz to 10GHz,detects hidden devices from 5cm to 15m away.The bug detector & camera finder scans up to 2,000 times per second.Your ultimate hidden camera detector, bug detector, and gps tracker detector to protect your privacy wherever you go,giving you peace of mind in seconds.It is a practical companion for business professionals to carry while traveling and for office use；
- [GPS Tracker Detector ]-Designed to find GPS trackers and magnetic positioning devices often hidden under vehicles or in concealed areas. The built-in magnetic sensor can detect magnetic suction-type trackers, strong magnetic locators, and other devices that contain magnetic fields or emit radio signals.
- 【Trusted by Security Experts & Users】- Worldwide,The detector isn't just another spy detector—it's a lab-certified privacy shield developed with surveillance technology experts and rigorously tested in FCC-certified laboratories. Join a global community of over half a million satisfied customers, including security professionals, government personnel, and privacy-conscious travelers who rely on our device for unmatched protection. When you choose us, you're not just buying a detector—you're investing in peace of mind backed by real-world testing and expert approval. Don't take chances with your privacy; trust what the professionals trust.
- 【Satisfaction Guaranteed】 -We promise to provide a two-year warranty for our smart hidden camera detectors! If you encounter any issues, please feel free to contact us, and we will reply within 24 hours. We firmly believe that providing excellent after-sales service is the best way to repay your trust
Is WiFireNet accurate enough for airports or stadiums?
No evidence in the reported work supports that conclusion. Airport and stadium deployment would require testing across different buildings, radio layouts, crowd densities, clothing, bags, body poses and interference conditions. It would also require an independently recorded evaluation, documented false-positive and false-negative rates, safety procedures, cybersecurity controls, privacy governance and certification by the relevant authority.
The current results establish a promising research direction: CSI can support handgun detection under the tested conditions. They do not establish a dependable percentage of travelers or spectators who would be screened correctly.
Can you buy a Wi‑Fi gun detector?
There is no named consumer detector in this work. FOI released research data, a model and code, not a packaged retail scanner, installation service or certification for security use. Reproducing the experiment would require compatible radio hardware, CSI access, the dataset and technical expertise; the publication does not specify a turnkey product or a universally supported router and adapter combination.
Does it replace metal detectors?
No. The authors position Wi‑Fi sensing as a complementary modality. A future system might combine radio sensing with cameras, metal detectors or human review, but the study does not show that WiFireNet can meet the reliability, throughput, legal and safety requirements of an operational checkpoint.
What happens next?
The released materials allow independent researchers to test generalization, examine why the higher-pilot-subcarrier configuration degraded results and collect data in rooms and sessions not represented in training. The most important next measurements are cross-room and cross-session testing, calibrated false-alarm rates, performance with realistic clothing and bags, and comparisons against established screening procedures under the same conditions.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
