Windproof and waterproof design ensures a stable connection. Equipped with noise reduction technology, high volume output, and long battery life. This helmet headset delivers clear and high-quality stereo sound, compatible with all smartphones. Deep bass and crisp treble response effectively solve the issue of low audio volume while riding. A wireless helmet headset that automatically connects to your device, providing a strong and reliable signal for seamless music playback and efficient cycling communication. Powerful signal transmission ensures smooth and uninterrupted calls and audio. The detachable nylon mounting system is easy to install and securely fits inside the helmet. Bluetooth range: 10M Answering method: Automatic Input method: Bluetooth Speaker diameter: 50MM Charging voltage: USB 5V Frequency response: 80Hz - 20kHz Distortion: Less than 1% Signal-to-noise ratio: 80dB Power supply: Built-in lithium battery 800mAh Size: 6cm Material: ABS Color: Black Package Contents: 2 x Headphones 1 x Charging Cable Note: Light and display differences may cause slight color variations between the image and the actual item. Measurement error allowed within +/- 1-3cm.