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The small print on a charging brick tells you what power it accepts and can provide, while its symbols identify insulation, regulatory conformity, disposal, or charging features. To decide whether it will work with your device, check the output ratings and charging protocol—not just the connector or a mark such as CE.
Start with the electrical ratings
Input: what the adapter accepts
The input line describes the electrical supply the adapter is designed to accept. It commonly lists an AC voltage range and frequency, measured in hertz (Hz). If you plan to use the charger in another country, check that this range covers the local mains supply. A plug that physically fits does not establish that the adapter accepts the local voltage. An industry checklist illustrates these label fields, but it is not a complete regulator specification: MSSI Electrical’s USB charger checklist.
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Output: what it can supply
The output line lists the direct-current (DC) voltage and current the adapter can provide, sometimes alongside a power rating in watts (W). For one output combination, multiply volts by amps to understand the wattage: 5 V × 2 A = 10 W. This calculation explains a printed rating; it does not establish compatibility by itself.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Some chargers list multiple output combinations. These indicate different supported operating modes, not power that every device will necessarily receive. The connected device and adapter must support a compatible mode, and charging speed can depend on their protocol as well as the adapter’s rating.
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AC and DC symbols
Chargers commonly distinguish AC input from DC output with symbols or text. The exact icon can vary between products; some labels also show polarity information. Read the symbol alongside the printed input or output line rather than assuming every manufacturer uses identical artwork. The checklist above illustrates typical label fields, and Medela’s power-adaptor symbol guide identifies DC-voltage and polarity markings.
What the familiar symbols mean
Square inside a square
The square within a square marks Class II, or double-insulated, equipment, according to Medela’s power-adaptor symbol guide. It describes the equipment’s insulation class. It is not a “Class 2” output rating and says nothing about how many watts the charger can provide.
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CE and UKCA
CE and UKCA are conformity marks tied to applicable product rules and markets. They are not consumer-review scores or universal guarantees of quality. In Great Britain, government guidance allows either mark for many relevant products when the applicable requirements are met; the rules also address visibility, legibility, and placement. That guidance is specific to Great Britain and should not be assumed to describe requirements in Northern Ireland, the European Economic Area, or elsewhere. See the UK government’s guidance on placing UKCA- or CE-marked products on the market in Great Britain.
A mark on its own does not tell you precisely which tests were performed or whether a particular online listing is trustworthy. If a charger seems suspicious, check the manufacturer, model, seller, documentation, and certification required where you will use it. In Canada, Health Canada advises shoppers to look for an accepted electrical certification mark on plug-in products and to verify that a replacement charger is compatible and its output voltage matches the device. Certification requirements vary by jurisdiction; conformity marks and third-party safety listings are not automatically the same thing.
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Crossed-out wheeled bin
The crossed-out wheeled bin is associated with separate collection of waste electrical and electronic equipment. Disposal procedures vary, so follow local e-waste instructions rather than putting the charger in household rubbish by default. The USB charger checklist illustrates this mark.
Other certification and technical icons
A label may also carry marks related to certification, electromagnetic compatibility, efficiency, or polarity. Their meaning depends on the exact mark and the rules in the relevant market. If you cannot identify an icon, look it up in the manufacturer’s documentation for that charger model; do not infer charging compatibility from an unfamiliar graphic.
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USB PD and fast charging
USB PD means USB Power Delivery. With USB-C PD, a compatible charger and device communicate to agree on a supported charging level. Electrical Safety First explains that USB charging starts with a 5 V default and that fast charging can negotiate a higher voltage through a digital exchange; see its USB charger safety advice.
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For radio equipment covered by the UK common-charger rules, the capability label includes minimum and maximum charging-power information and indicates USB PD support when the equipment supports that protocol. This is a rule for covered equipment, not a universal label requirement for every charger worldwide. The requirements appear in Schedule 1B of the UK Radio Equipment Regulations 2017.
Quick Recap
Check compatibility before using a charger
- Check the device maker’s requirements. Find the specified output and charging protocol in the manual or official product documentation. Do not rely on connector fit alone.
- Compare the charger’s output. Make sure its listed voltage and supported charging modes are appropriate for the device. Treat the wattage as the adapter’s capability, not a guarantee of power delivered.
- Confirm protocol support. For a USB-C device that requires or benefits from USB PD, check that the charger supports USB PD. A USB-C port by itself does not confirm this.
- Check input for travel. Compare the charger’s input range with the destination’s mains supply; an adaptor for the plug shape does not change the charger’s electrical input range.
- Choose a reliable replacement. Buy from a reputable source and check any certification required in the country where you will use it. Health Canada’s advice is specifically for Canadian purchases; other markets have their own rules.
- Inspect the charger and cable. Stop using damaged equipment. Electrical Safety First’s USB charger safety advice offers additional safety guidance.
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