. Compact size and lightweight, easy to carry. Built-in large capacity 500mAh rechargeable battery, CSR8635 imported UK chips. Latest 4.1+EDR Bluetooth technology, superior signal transmission, ultra-low power consumption, compatible with iPhone and Android devices. (Press the power button once to answer the call. Press the button again to hang up.) Built-in high-quality anti-interference microphone, external windproof sponge, supports hands-free calling, high fidelity audio. Supports music track control, volume adjustment, playback, pause, automatic redial and other functions, easy to operate. Built-in mini USB charging interface for quick and easy charging. Built-in large capacity lithium battery with multi-circuit protection, long standby and working time. Tone reminder function allows easy setup. Auto-reconnection with memory function. (If your device was the last paired device, the headset will automatically re-pair when powered on.) Excellent performance 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 Support: Stereo Music (A2DP) Frequency: 2.402GHz - 2.480GHz Transmission range: 20-30 meters (depending on the device) Microphone transmission distance: 1 meter Playback time: 15 hours Standby time: 240 hours Charging time: about 3 hours Li-ion battery: 3.7V/500mAh Charging voltage: 5V Waterproof rating: IP45 Distance between left and right speaker: Approx. 43cm Speaker wire length: Approx. 17cm Speaker diameter: Approx. 4.1cm Net weight: 127g Note: 1. The helmet headset must be fully charged (about 2 hours) before first use. 2. The LED indicator stays solid red while charging and turns off when fully charged. 3. The headset cannot play music or answer calls while charging. Package Included: 1 x Helmet Bluetooth Headset 1 x USB Cable 1 x User Manual 1 pack Accessories