The NC1284 is a 12V/7Ah NiCd battery belt offers a control box with two 4-pin XLR plugs and an LED power gauge. Cool-Lux MaxPower belt use nickel-cadmium (NiCd) cells that are voltage-matched for every belt. This is called cell balancing. Cell balancing allows all the cells to charge and discharge at the same rate, preventing premature battery failure. It is an expensive, time consuming quality check, but one that is extremely important. It ensures that every cell performs to optimal performance. The belt itself is virtually indestructible and constructed with rugged, lightweight 1000-denier nylon. Each is precisely cut and stitched with durable, condensed, heavy-duty thread to assure a smooth, tight surface with the cells firmly encased. NC3912 charger included.