【All-in-one Power Supply】30W universal power adapter, compatible with various 3V to 12V home electronics: routers, speakers, doorbells, tablets, LED light bars, aquariums, CCTV camera systems, USB charging cameras, DIY ports, etc. 【Safety Protection】This versatile power adapter is made of ABS + PC material and has a built-in smart chip to prevent overvoltage, overcurrent, short circuit and overheating, making it safe and reliable. 【Multi-Tip Charger】AC Input: 100-240V, 0.25A, 50/60Hz; DC Output: 3V/4.5V/5V/6V/7.5V/9V/12V; USB Interface: DC 5V 2.1A; Cable Length: 110cm / 3.6ft. 【Wide Variety】8 power connectors, positive (+) adapter plug: 5.5 x 2.5mm/5.0 x 2.1mm/4.0 x 1.7mm/3.5 x 1.35mm/3.0 x 1.1mm/2.5 x 0.7mm/Micro USB port + LED. port, variable voltage is easy to select, you can convert the voltage with the included key. 【Important Note】DC plug polarity: positive (+) inside and negative (-) outside. The polarity cannot be reversed. Please check the output information of your device