SPECIFICATIONS Bluetooth: Bluetooth V5.3 Support Profiles: A2DP,AVCTP,AVDTP,AVRCP,HFP,SPP,SMP,ATT,GAP,GATT,RFCOMM,SDP,L2CAP Operation Distance: 10m Transmitting Power: Class 2 Frequency Range: 2.402 -2.480 GHz Speaker: Ø40mm Impedance: 32Ω TF card Supported: 128M-32G Radio Frequency Response: 87.5-108MHz Rechargeable Lithium Battery: 400mAh Music Playing Time: 7h Talking Time: 7h Charging Time: 2.5h