Detailed Product Description Mono and Stereo 2 in 1 Bluetooth headphone,U&I-20 Main FeaturesDual-Mic & Noise Filtering, more ... 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-20T)CE, FCC, RoHS approval Product SpecificationsBluetooth Specification: ...