Features: No Need To Change Battery Frequently: With this AAA battery eliminator QC3.0 USB cable,you don'for t need to buy a lot of replacement batteries when the batteries run out,saving you more for time and money. When QC3.0 USB input, output is 5V-12V adjustable voltage,your USB adapter must with for QC 3.0 12V output,if standard USB 5V input,output is 5V,can not change voltage. Press the button voltage to change 0.2V each for time, adjust to the maximum voltage and then press the button voltage to reduce 0.2V each for time. When the voltage is set to 12V, the next for time you use the default 12V, only supports QC3.0 wall or car USB charger or QC3.0 USB powerbanks. This eliminates the need for 4-8 pcs 1.5V AAA batteries. Suitable for Radio,electric toy, holiday LED lights,Clocks,Calculator,power remote controller, keyboard,Electronic door lock and more AAA Battery power supply devices,Suitable for 5V 6V 7.5V 9V 12V and more 5V-12V AAA Battery Powered device. Specifications: Input Voltage: QC3.0 USB charger with 5V-12V ouput Output Voltage: DC5V to 12V(can adjustable voltage) Cable Length: Approx. 95cm 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. Package includes: 1 X QC3.0 USB to 5V-12V adjustable voltage AAA Dummy battery Cable 7 X AAA Dummy battery