Features: USB 5V to 4.5V No. 5 2A virtual battery power cord set. Input USB 5V2A, virtual battery output 4.5V1A, replacing 3pcs 1.5V 2A LR6 batteries. Money saving, environmentally friendly, reusable, no need to frequently replace batteries, the green ones are fake batteries used as conductors. It can be powered by a mobile power supply with a USB interface and a USB adapter. Suitable for Christmas decorative lights, toy, remote control, LED lights and more.