Q3 S520 Universal Stereo Headset Bluetooth Earphone Mini V4.0 + EDR Wireless Headphone For Both Sides White Newest wireless CSR 4.0 + EDR bluetooth headphone headset In earphone Stereo two-channel mp3 music handsfree with vibration microphone for most smartphones and other bluetooth devices. This product uses the new headset shape design, using the world famous Bluetooth Stereo Bluetooth chips, to ensure high-fidelity sound quality and stable performance and excellent call quality. Support for Bluetooth A2DP and calling features Battery time supports up to 4-6 hours.