Instructions on how to choose a suitable adapter: 1. Please check the voltage: Check your device working voltage. It should be 12V DC, not be AC 12V or lower/higher than 12V DC. Otherwise, your device will not work or be damaged. 2. Please check the current Check the max current your device will draw. It should be equal to or less than 2A, such as 0.5A 1A 1.5A. Otherwise, your device will not work and the power supply will be damaged. 3. Check the power input port of your device Check the power input port of your device. Its outer diameter should be 5.5mm; inner core diameter should be 2.5mm or 2.1mm. Inner core polarity should be"+", exterior polarity should be" - ".