Features: brand new and high quality. Replace 2x AA AAA battery power supply cord. This eliminates the need for 2x 1.5V AA AAA batteries. Suitable for Radio,electric toy, holiday LED lights,C-D player,Clocks,luminara candles,Calculator,power remote controller, keyboard, Christmas advent calendar display,Walkman and more 3V power supply devices Nice to be able to connect it with other 3V Christmas items and not have to worry about tuning on or off. Input USB 5V,output for DC 3V,but this cable can not use to charge battery. Power supply from USB charger,power bank,car charger and more USB adapter. Black cable is -,Red cable is + Color: Black Material: Plastic Power Cable length: 104cm input: for DC 5V 2A Max output: for DC 3V 1A(max) Note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1x for DC 5V to 3V Power Supply cable