1.OEM welcomed, 2.professionl manufacturer, 3.stereo bluetooth v3.0 headphone, 4.insert tf card 5.with microphone

Bluetooth version:V2.1+EDR                               Range of frequency:2400.0-2483.5MHz              Operating range:up to 10m                      Chipset:CSR                                      Talk time:up to 10 hours                          Musice Playing Time:up to 8 hours                 Stand-by Time:up to 150 hours                   Weight:100g                                 Support TF Card.

bluetooth headphone

bluetooth headphone WST-502