Model: MyBat Pro Bliss Wireless Version: 5.3 Support Profiles: A2DP,AVCTP,AVDTP,AVRCP,HFP,SPP,SMP,ATT,GAP,GATT,RFCOMM,SDP,L2CAP Operation Distance: 10m Frequency Range: 2.402 -2.480 GHz Speaker: Ø40mm Impedance: 32Ω Frequency Response: 20Hz-20KHz ANC Amplitude: 25±3dB ANC Frequency Range: 20-600Hz Rechargeable Lithium Battery: 400mAh ANC on Music Playing Time: 25h ANC on Talking Time: 21h ANC off Music Playing Time: 35h ANC off Talking Time:25 h Charging Time: 1.5h