... , FCC and Rohs EGO VV passthrough ego usb battery variable voltage EGO VV passthrough variable voltage for electronic cigarette, power supply is from computer ... 8V;2. only 3 times pressing button will change the voltage, fast and simple;3. compatible with all Ego/510 threads ... Cigarette from Smaild, smart design, and longworking time, support various voltage.Any question pls fell free to ask me, I will ...