Windproof and waterproof connection is more stable. DSP noise reduction technology, high volume and high battery life. This helmet headset transmits clear and stereo music, compatible with all smartphones Deep bass and crisp treble response can perfectly solve the problem of not being able to hear the earphone sound when riding. A helmet wireless headset, automatically connected to enjoy music, the connection signal is strong. Provide efficient and convenient cycling communication. Powerful signal transmission allows you a smooth and unimpeded communication experience. The detachable Nylon Sticker design is easy to install in the helmet, and the fixation is firm Bluetooth distance: Greater than 10M Answering method: automatic Input method: Bluetooth Speaker specifications: diameter 50MM Charging voltage: USB5V Response frequency: 1 80-2000KHZ Distortion: Less than 1% Sound to noise ratio: Greater than 80dB Power supply mode: built-in lithium battery 800MA size:6cm Material:ABS colour:black Package Contents: 2 * headphone 1 * charging cable Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.