Bluetooth Sports Neckback EarphoneBluetooth version: V4.0 CSR8635 Valid distance: 10mSize: 31��28��9mmWeight: 17.2gTalking time: 7hrsStandby time: 120hrsCharging time: 2.5hrsBattery: 3.7V 110mAhColor��Red ， Purple ， Grey ， Blue ， GreenProduct include: 1 X headphone