Features 1. Compact size and light weight, easy to carry. Built-in large capacity 500mA battery, CSR8635 imported chips from UK. 2. Latest 4.1 + EDR bluetooth technology, superior signal transmission, extremely low power consumption, compatible with iPhone and Android devices. 3. Support automatic CALL ANSWER function with phone number sent and safer driving. (Press the power button once to answer the call. Press the button again to hang up. Press the button twice to redial the last phone number directly.) 4. Built-in anti-interference microphone, external windproof sponge, can effectively answer hands-free calls, hang up the phone, high fidelity. 5 .Support for up and down music, adding and subtracting volume tones, pause playback, auto callback and other functions, easy to use, easy to use. 6. 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. 7. Tone reminder function, easy to set the machine according to the tone reminder. 8. Automatic repair with memory function. (If your device is the last paired device, the headset will automatically pair with your device again when the device opens it again.) 9. Excellent performances for full face helmet / half face helmet, off-road helmet, flip-up helmet, etc. Specification: Material: Plastic Color: Black Bluetooth name: BT12 Bluetooth version: 4.1 + EDR Frequency: 2.402 GHz - 2.480 GHz Transmission range: 20-30 meters (depending on the device) Transmission distance of the microphone: ≤ 1 meter Playback time: ≤ 15 hours Standby time: ≤240 hours Charging time: approx. 3 hours Li-ion battery: 3.7 V / 500 mA Charging voltage: 5V Interval between left and right horn: Approx. 43 cm Horn wire length: Approx. 17 cm Diameter of the horn: approx. 4.1 cm Net weight: 127g Note: 1. The helmet headset must be fully charged (approx. 2 hours) before first use. 2. The LED indicator glows red continuously while charging and goes out when the battery is fully charged. 3. The headphones cannot play music or receive calls while charging. 4. Please allow a little error due to manual measurement and slight color difference from light and screen. Package includes 1 x Wireless Headset Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.