1. and of . 2. Compact size and lightweight, easy for carry. 3. Using latest CSR V5.0 Bluetooth technology, superior signal transmission, ultra-low power consumption. 4. Support all Bluetooth devices, support automatic answering function, no need to answer the phone manually when calling, safe driving. 5. Large button design, the choice for male riders. Built-in anti-interference microphone, external windproof sponge, can effectively realize hands-free answering, hang up the phone, high sound fidelity. Support up and down music, volume sound addition and subtraction, playback pause, automatic callback and other functions, easy to operate, easy to use. Built-in headphone speaker, strong bass, clear mid-range, high-pitched sound. Built-in mini USB charging interface for quick and easy charging. Built-in large capacity lithium battery, multi circuit protection, long standby and working time. Bluetooth version: bluetooth 5.0 Frequency:2.402GHz-2.480GHz Range:10-15 meters(depending on device) Transmission distance of microphone: less than 1 meter Li-ion battery: 3.7v/800mA Charging voltage: 5V Charging time: less than 1 hours. Standby time: less than 48 hours Bluetooth name: BT17 Color: Black Material: ABS Package Contents: 1 x headphone 1 x USB cable 1 x English instruction manual