Equipped with 2 Charging Indicator LEDs per charging bay, all around venting for constant cooling, and bottom molded for optional mounting. 1 bay is compatible with M12 batteries, 1 bay is compatible with M14 & M18 batteries. Compatible Milwaukee M12 Battery Part Numbers= 48-11-2430, 48-11-2401, 48-11-2420, 48-11-2440, 48-11-2460, 48-11-2402, and our very own Banshee 5A