Please feel free to contact us if you have any questions about our products and service.Hope you can give us a five-stars feedback if you are satisfied with our products and service.product:Bluedio T2+ THD:<0.1%(TH + D)Bluetooth version:V4.1V4.1 + EDRTalking time:maximum 45hoursSupported profiles:A2DP/AVRCP/H2+SP/H2+FPMusic time:maximum 40hoursDrive: 57mCharging time: About 2 hoursSpeaker lmpedance:16��standby time: maximum 1625hoursSPL:118dBCharging connector:Micro-USBCommunication distance:10mHeadphone size:186*85*200mmFrequency Response20-20KHzpackage size:200*170*85mm