PRIME HIFI Dual Stereo bluetooth Headset Stereo Bluetooth 4.0 Headset with HiFi sound quality incredible bass response with a wide range of frequencies Exclusive noise Canceling with 4 times noise cancellation Up to 50 hours of talk/listen time and 1200 hours of standby time multi-point technology Bluetooth 4.0 USB charging line with DC charger AC wall charger and user guide.