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, high-quality stereo sound and is compatible with all smartphones. Deep bass and crisp treble response effectively solve the issue of low audio volume during rides. A wireless helmet headset that automatically connects, providing strong signal transmission for efficient and convenient cycling communication. Powerful signal performance ensures smooth and uninterrupted calls and music playback. The detachable nylon mounting system is easy to install and securely fits inside the helmet. Specifications: - 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 source: 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 is permitted within +/- 1-3cm.