BOLUOYI Bluetooth Headphones Wireless HiFi Stereo Supra-Aural Earmuff Earbud Headset

 Bluetooth Wireless Type Headset Stereo Earphone Bluetooth V2.1+ EDR Stereo Behind-the-Neck Headphone - Black + Blue from bangood.     Long talk time,all phones universal, Music player with A2DP     Function Keys : Volume + -, music playback, pause, previous song, next song     Supports all bluetooth devices,then hang up, reject calls, last number call-back Specification:          Weight:40g     Voltage:3.7V     Channel:stereo     Talk Time:14 hours     Main Chip:3.0 + EDR     Speaker:?30 speaker     Standby Time:250 hours     Bluetooth Version:V3.0 + EDR     Compatible With:V2.1, V2.0, V1.1     Charge / Discharge protection: IC     Battery:Rechargeable Lithium Polymer     Frequency Range:2.4G     Frequency Response Range:20-20KHZ     Transmission Power:Class2     Transmission Frequency:2.4GHz     Transmission Distance:10 meters     Average Sensitivity:105DB (AT 1KHZ +3 DB)     Supported File Formats: A2DP, Headset and Handsfree mode Package Included :     1 x USB Cable     1 x Bluetooth Mini  Headset