Features: *BT5.0 technology, two-channel stereo headphones, great sound quality.*Equipped with wired functional buttons. It is easy to control and use.*With mic, designed for motorcycle helmet. Blocks out wind and noise in extreme road environment.*Bendable metal hose, convenient for answering calls.*Long standby and working time. Smart and lightweight. Specifications: Model: T81 Color: Black BT Version: 5.0 Frequency: 2.402GHz - 2.402GHz Range: 10-15 meters (depending on device) Transmission Distance of Microphone: _1 meter Battery Capacity: 250mAh Working Time: About 5 hours Charging Voltage: 5V Charging Time: About 2 hours Standby Time: About 48 hours Package Size: 22.3 * 11 * 3cm / 8.78 * 4.33 * 1.18in Package Weight: 107.7g / 3.8oz Package List: 1 * Helmet Headphones2 * Sticker1 * USB Charging Cable1 * User Manual (Chinese / English)