The M3b Pro has all of the quality of the CCell M3b battery, but raises the bar with its ability a micro sensor in the bottom that enables you to activate the m3b pro with one draw, no other gimmicks. The m3b pro allows the user to change between 3 heat settings while providing best flavour and potency. It also features a child-resistant lock, and sleek stainless-steel housing. A green flashing light will indicate the battery is charging. A solid green light (no longer flashing) means the battery has reached a full charge.