Detailed Product Description Mono and Stereo 2 in 1 Bluetooth headsets,U&I-20 Main FeaturesDual-Mic & Noise Filtering, ... more fashion With In-ear Earpiece, more popular and comfortable BLUETOOTH V2.1, higher version, higher tech. MICRO USB Universal Charging, future ... A2DP, AVRCP U&I-20T: Headset, Handsfree, Multi-pointTransmission Power: Class 2Operation Range: Up to 10 MetersFrequency Range: 2.40-2 ...