TOBWOLF 2PCS 9V 1A Power Supply Adapter, 9W AC 100V-240V to DC 9V 1A Universal Switching Transformer, 9V 1A Switching Adapter AC to DC Converter for MP3, MP4, Routers, 5.5mm x 2.5mm Plug

How to choose correct power supply? 1. Check the Voltage: Please check the parameter label of your device and check the working voltage. It should be 9V DC, not be AC 9V or lower/higher than 9V DC. Otherwise, your device will not work or be damaged. 2.Check the Current: Check the max current your device will draw. It should be equal to or less than 1A. Otherwise, your device won’t work well and the power supply will be damaged very soon. 3. Check power input port: Check the power input port of your device. Its outer diameter should be 5.5mm, inner core diameter should 2.5mm or 2.1mm. Inner core polarity should be"+", exterior polarity should be" - ". Otherwirse, the power supply can't be plugged into your device.