BLUETOOTH 5.0 + EDR : Helmet Bluetooth device compatible with almost all Bluetooth-enabled mobile devices. The maximum effective distance is 20-30 meters, supporting smart phones, allowing you to stay connected to your phone and enjoy music, providing efficient and convenient communication during the ride. LONG PLAY TIME : Built-in 180mah Rechargeable Li-Ion Battery, Long Stand-By and Working Time. Support Up to 5 Hours Continuous Talking and Playing Time, 80 Hours Standby Time. Charging Time 1 Hours. PEREFECT SOUND QUALITY : by Using Windproof and More Stable Connection.DSP Noise Cancelling Technology, Loud Volume, This Bluetooth helmet headset Transfers Clear and High-Quality Stereo Music Sound. Compatible with All the Smart Phones with Bluetooth Function, Mp3, GPS Are Supportable Independently. EASY TO INSTALL : Design with Detachable Velcro, Easy to Install It into the Helmet, Fixed Firmly. Remove the Side Padding from the Inside of the Helmet (If It Can Be Removed) and Place the Devices and at the Height of Your Ears. HANDS-FREE : Helmet intercom Bluetooth allows you to pick up hands-free call safely. Truly free your hands. Never worry about missing any call when riding a motorcycle.