Windproof and waterproof connection is more stable. noise reduction technology, high volume and high battery life. This helmet headset transmits clear and high-quality stereo music, compatible with all smartphonesDeep bass and crisp treble response can perfectly solve the problem of not being 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 is easy to install in the helmet, and the fixation is firmBluetooth distance: 10MAnswering method: automaticInput method: BluetoothSpeaker specifications: diameter 50MMCharging voltage: USB5VResponse frequency: 1 80-2000KHZDistortion: Less than 1%Sound to noise ratio: 80dBPower supply mode: built-in lithium battery 800MAsize:6cmMaterial:ABScolour:blackPackage Contents:2 * headphone1 * charging cableOnly the above package content, other products are not included.Note: Light 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.