Windproof and waterproof design ensures a stable connection. Equipped with noise reduction technology, high volume output, and extended battery life. This helmet headset delivers clear, high-quality stereo sound, compatible with all smartphones. Enhanced bass and crisp treble response help overcome audio clarity issues while riding. Wireless helmet headset with automatic Bluetooth pairing for seamless music enjoyment and strong signal transmission. Provides efficient and convenient communication for cycling. Strong signal performance enables smooth, uninterrupted calls. Detachable nylon design allows easy installation into the helmet with secure fit. Bluetooth range: 10M Answering method: Automatic Input method: Bluetooth Speaker diameter: 50MM Charging voltage: USB 5V Frequency response: 80-20000Hz Distortion: Less than 1% Signal-to-noise ratio: 80dB Power source: Built-in 800mAh lithium battery Dimensions: 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 actual item. Measurement allows an error of +/- 1-3cm.