SAFE AC/DC ADAPTER: AC 100-240V (50/60Hz) input, DC 3V/ 4.5V/ 5V/ 6V/ 7.5V/ 9V/ 12V (0-2A) output + 5V/1.2A USB port, includes a 5FT cable; built-in smart chip with quad-protection against overvoltage, overcurrent, short circuit, and overtemperature, certified by safety standards; Key Tip: If "Not Working" occurs, first check two points: 1. Is the voltage position locked (use the included voltage key to lock; failure to do so will result in unstable power supply); 2. Is the polarity of the device consistent with the adapter (center positive +; reverse polarity will result in a non-functional connection). If it's not a product issue, please contact customer service POWER SUPPLY WITH MULTI VOLTAGE: 3V/4.5V/5V/6V/7.5V/9V/12V. The wall plug ncludes a voltage selector tool, allowing you to directly replace damaged single-voltage adapters; Key Note: The voltage must match the device exactly (not higher or lower than the device's marked voltage). For example, if a device is labeled "5V 1A," select the 5V setting. Selecting 6V will burn the device, and selecting 4.5V will cause it to not work. Do not use with devices above 12V (such as 19V laptops) to prevent voltage mismatch 8 VERSATILE ADAPTER PLUGS: Comes with 8 precision-machined interchangeable tips (5.5*2.5mm(for Router, LED light strip, power box), 4.8*1.7mm(scale, small electric fan, DVD player), 4.0*1.7mm(Old charger, small keyboard), 3.5*1.35mm(Cameras, handheld devices), 3.0*1.1mm(Electronic toys, music players), 2.5*0.7mm(BT speakers, small appliances), Micro-USB(for Android phones/tablets older model), LED terminal connector(DIY projects/LED light strings)) - covers 99% of common DC ports for 3V-12V household electronics, No need to buy multiple chargers - one replaces all, saving space and cost. Note: Not compatible with USB-C devices! MULTI PURPOSE COMPATIBILITY: This 3V-12V AC/DC Adapter replacement comes with 8 interchangeable Tips and 7 adjustable Voltages, which makes it fits 95% of AC/DC home appliances, Such as Tablet PC, LED Strip Lights, Keyboard, Scales, Routers, Speakers, CCTV camera system, USB Charging Camera, DVD Player, CD player, USB hub, recorder, exercise bike, clock, trail camera, weather station and more 3V to 12V Household Electronics (NOTE: Not Compatible with Radio/Laptop/ Over 12V DC device!) SUPPORT 12V 2A POWER: This SoulBay 30W Universal ac/dc adapter supplies 2000mA max output current at each voltage output, that's to say you can use this item for devices within 0 to 2A current range; Power adaptor is easy to select the output voltage and convert to different volt with ease using the provided key, simple plug and use.[NOTE: (1).DC Plug Polarity: inner Positive(+), outer Negative(-); (2). Any issue for the product, please keep free to Contact us before returning, WE ALWAYS STAND BEHIND