Ailihen BT-02 Over-ear Wireless Bluetooth CSR 4.0 Headphones Foldable Stereo with Build-in Microphone,Folding Wired Music Headsets (Black/Orange) Bluetooth CSR4.0 Version Chipset provide great cover range and easy connection.360-degree microphone pickup provide high quality phone calls. Clean bass, mid and treble. Well equalized, realtone headphones . Play/Pause, Volume, and Track control. Soft leather earpads and ergonomic design make this headsets comfortable for long time wearing. Foldable and lightweight design for easy storage. Take it everywhere. Up to 500MA battery capacity, make the headphone long standby. Charge takes only 2.5 hours for one time, 10-15 hours using and 60 hours standby. Compatible with cellphone, tablet, laptop, Bluetooth-enabled smart TV / Smart TV Box,other bluetooth devices.