... Mono and Stereo 2 in 1 Bluetooth headphone,U&I-20 Main FeaturesDual-Mic & Noise Filtering, more clear sound For Mono ... Product SpecificationsBluetooth Specification: V2.1 + EDRBluetooth Profiles Supported: U&I-20: Headset, Handsfree, A2DP, AVRCP U&I-20T: Headset, Handsfree, Multi ...