It adopts 50mm-HiFi dynamic coil speaker with high dynamic sensitivity, high Fidelity and other characteristics.Supports AAC/SBC advanced audio decoding mode , enjoy the professional-grade music Sense of bass , thick and boring/ medium- frequency level clear/ high-pitched .P9 Wireless Bluetooth headset Supports Stereo Music Supports TF card Spot with microphone , transmission distance 10m , Battery Capacity 400mah , sensitivity 105 ~ 3db , Speaker Diameter : 40mm , Playtime 10hrs , Standby time 12hrs , charge time 2hrs , Built – in – microphone YES , TF Card Support , Charging Port USB , Song Switching Support , Audio Interface supportAnd also great value for money