Features: Dummy battery is conductor, no power, with ON OFF switch, which is easy to use. Made of high quality plastic material,which is durable and reliable. Replace 2pcs 1.5V AM4 LR3 AAA battery power supply cord,This eliminates the need for 2pc 1.5V AAA batteries,blue dummy battery is conductor,AAA Fake batteries cannot be used in parallel, only in series. Suitable for electric toy, holiday LED lights,clocks and more AAA Battery power supply devices. With this 3V AAA battery eliminator 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. Specifications: Material:Plastic Input: USB 5V Output: 3V Cable Length:Approx. 1m/2m Package Includes: 1 Set Dummy Battery Adapter note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.