Bluetooth Version: Bluetooth 5.0 Support Profile: Support A2DP/AVCTP/AVDTP/AVRCP/HFP/SPP/SMP/ATT/GAP/GATT/RFCOMM/SDP/L2CAP profile Working Distance Range: 20m Battery: 400mAh, Built-in rechargeable lithium-ion battery Charging Voltage: 5V/1A Charging Time: About 2.5hrs Talking/Music Time: LED lights turn on for about 7hrs/turn off for about 12hrs Impedance: 32Ω Sensitivity: 105±13db