Bluetooth 5.1, Power Output 40W, Frequency Response 65Hz to 20kHz, Signal to Noise Ratio >80dB, Battery Capacity 7500 mAh / 27 Wh, Battery Chemistry Lithium-Ion Polymer (LiPo), Battery Voltage 3.6 V, Estimated Battery Life 20 Hours, Battery Charging Time 4 Hours, Dual Passive Bass Radiators, IP67 Waterproof and Dustproof Rating