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Dummy battery is conductor, no power, with ON OFF switch, which is easy to use. Replace 3pcs 1.5V LR3 AAA battery power supply cord,This eliminates the need for 3pc 1.5V AAA batteries,AAA Fake batteries cannot be used in parallelism, only in series. Suitable for electric toy, holiday LED lights,clocks and more AAA Battery power supply devices. With this 4.5V AAA battery eliminator USB cable,you are not need to buy lot of replacement batteries when the batteries runs out,saving you more for timeand money. Power supply from USB charger,powerbanks,car charger and more USB adapter.