◆ Wireless Transmission Range: 10M ◆ Audio Performance To Noise Ratio: ≥ 90db ◆ Battery Capacity: 1200mAh ◆ Built In Voltage: 3.7V ◆ Normal Volume Playing: 3H ◆ Speaker Specification: ¢ 52MM * 2 ◆ Horn Power: 4 Ω/5W * 2 ◆ Frequency Response: 120HZ-20KHZ ◆ Product Size: 7.17* 2.89* 2.72in ◆ Single Machine Weight: 413g (bare Machine)+105g (color Box Accessories) ◆ Charging Voltage: 5V/500MA.