Detailed Product Description Super Slim Mono/Stereo 2 in 1 Bluetooth headphone, U&I-20 ... Use, more flexible options Aluminium Housing, to be noble Super-Slim Design, more fashion With In-ear Earpiece, more popular and ... comfortable BLUETOOTH V2.1, higher version, higher tech. MICRO USB Universal Charging, future standardizationMulti-point Function(U&I ...