RB-T9 Bluetooth Sports In-ear Wireless Earphone Headset which is compatible with smart mobile and tablet which have the Bluetooth function. A phone call and music all control using one button in the earphone, as convenient as possible Can remind the remainder electric quantity smartly. Support multi-languages. RB-T9 Bluetooth wireless headset is perfect for those looking to exercise, listen to music, driving up the phone to connect to two devices simultaneously. Lightweight and durable. Excellent noise cancellation technology makes voice is much clearer. With HD Voice technology provides excellent sound quality and crystal clear sound clarity with buttons for an opening - and closing up - volume down on the side