XO E6 UV400 sunglasses with Bluetooth audio function to listen to your favorite music. - Energy efficient Bluetooth 5.0 chip- an improved 120mAh battery will allow you to listen to music for up to 4 hours- convenient touch volume control and answering the incoming call- multi-functional button to switch songs or call Google Assistant / Siri- UV400 ultraviolet protection Specifications: Model: E6Bluetooth version: V5.0+EDRFrequency range: 2402-2480 MhzMusic playback: 3-4 hoursMaximum standby time: 200 hoursMaximum distance: 10mFull charge time: 1-2 hoursBattery capacity: 3.7V/120mAhSupported audio protocols: HSM/A2DP/AVRCPMaterial: PC plastic + TAC polarized lensSize: 170x95x73mmWeight: 31 g