LONG WORKING TIME：Built-in 500MA rechargeable lithium ion battery, the device has a long standby and operating time, the standby time is up to 180 hours, and the operating time is up to 30 hours after full charging. Bluetooth headset battery level indicator can be checked on mobile phone, which is clear at a glancePERFECT SOUND QUALITY：Enjoy clear sound with APTX LL and DSP noise reduction technology. DSP echo cancellation and noise reduction technology ensures high speed and clear voice quality. Enjoy the beautiful scenery and high-quality music while driving.IP67 WATER Density：With nano coating technology, dust and waterproof, the headphones can be safely protected outdoors. Don't worry about rain or snow. This helmet headset will be a good choice for outdoor riding this season.Suitable for all stunning helmets：The speaker thickness of this motorcycle Bluetooth headset is about 10mm, it is recommended to check before buying if your motorcycle helmet has a groove of about 10mm to avoid causing unnecessary trouble. If you have any questions, please feel free to contact us.CONNECTION STATE：20-meter Bluetooth transmission distance, stable sound quality. There is also a mobile phone battery indicator that allows you to monitor the battery performance of the motorcycle Bluetooth headset in real time.