Windproof and waterproof design ensures a stable connection. DSP noise reduction technology delivers high volume and long battery life. This helmet headset provides clear, high-quality stereo sound and is compatible with all smartphones. Deep bass and crisp treble response effectively solve the issue of low o volume during riding. A wireless helmet headset that automatically connects, offering strong signal transmission for smooth and uninterrupted communication. Ideal for efficient and convenient cycling communication. The detachable nylon mount is easy to install and securely fits inside the helmet. Bluetooth range: 10M Answering: Automatic Input: 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 is +/- 1-3cm.