2 × 1.5 inch titanium diaphragm driver, 2 × Passive radiators Input: 5V2A (BT: 8.0dB +/ 1dB) Audio Output: 16w (2*8W) Battery Capacity: 6700mAH Charge Time: about 4 hrs Bluetooth Frequency Range: 2402-2480 Mhz Speaker Unit High Frequency Range: Up to 40kHz THD+N: <1% Model number: A3117