Zapco ST-64D.BT 360 watt 4 Channel Amplifier with Bluetooth 4-Channel, full-range, Class D amplifier. 360W. RCA and speaker level inputs; Auto-on with speaker level inputs. Bluetooth music streaming. Variable input gain control; Variable electronic crossover; Variable bass boost control. Micro chassis: 6.3 x 2 x 11.8 inches.