☛Function: Please adjust the voltage before use,Replace 2 to 8pcs 1.5V AAA battery power supply cord,This eliminates the need for 2 to 8pcs 1.5V AAA batteries | ☛Easy to Use: if your device needs 2pcs AAA battery,please choose 3V gear,and use 1pc AAA dummy battery,if your device needs 3pcs AAA battery,please choose 4.5V gear,use 2pcs AAA dummy battery,and so on,6V=4AAA Batteries, and so on | ☛Battery Replacement: With this AAA battery replacement power supply, you don't need to buy a lot of replacement batteries when the batteries run out,saving you more time and money | ☛ Widely Used: Suitable for Camera, Flashlights, controller, Radio, electric toy, fan, holiday lights,Clocks,luminara candles,Walkie talkie,Calculator,power remote controller, keyboard,Walkman and more AAA Battery power supply devices | ☛Note: Green dummy battery is conductor,no power,AA Fake batteries cannot be used in parallel, only in series