This is a 100mAh variable voltage battery called the EVOD Twist. They are compatible with eGo-T and eGo products and have a unique feature called the eGo-C click lockout. This feature allows you to lock the battery by clicking the button five times rapidly. You will see the LED flash which shows that you have done this correctly. This will prevent the battery from providing power when you do not want it and so adds a really useful safety feature to your e-cigarette. To unlock, you do the same thing. Press the button five times rapidly, and the LED will flash again to confirm it is unlocked. You need no longer worry about carrying them in your pocket or bag with this great feature. The button has a white LED, and the battery itself is stainless steel colored. It has a 510 thread, and the voltage can be adjusted between 3.2 volts and 4.8 volts. *Works with all cartridges we carry.