This eGo style USB passthrough plugs into a USB port on your notebook or PC.
Has a 2 foot long cord and is great for travel.
Press the button 5 times to turn off the battery and press it 5 times to turn it back on.
You are also able to unplug the USB cable and use it as a regular 900 mah battery.
This style passthrough has a Blue LED with the new style hard plastic switch.
Price is per one battery and USB cable.