Designed specifically for Kenwood handheld radios, the KNB-17A battery pack is composed of Nickel Cadmium, allowing it to hold a sizable charge of 1200 mAh and able to deliver up to 7.5 Volts of power. The battery pack works with the following Kenwood TK models: TK190, TK280, TK290, TK380, TK390, TK480, TK481.