The USB 510 Passthrough conveniently plugs into your computer's USB port.  This battery is "always on" and perfect for those of us who spend the day in front of the computer.  It is also great for using with your car charger.  Keep on truckin!

The HV passthrough, unlike other passthroughs, does not contain an unwieidy battery box and features a red led.  Plugged into a powered USB port, it gives REALLY big vapes.