Detailed Product Description Super Slim Mono/Stereo 2 in 1 Bluetooth headphone, U&I-20 Main FeaturesDual-Mic & Noise Filtering, ... more flexible options Aluminium Housing, to be noble Super-Slim Design, more fashion With In-ear Earpiece, more popular ... MICRO USB Universal Charging, future standardizationMulti-point Function(U&I-20T)CE, FCC, RoHS approval Product SpecificationsBluetooth Specification: ...