Fangrui Product Details 1. No Manual Operation Is Required, Incoming Calls Are Automatically Answered To The Safety Of Cyclists; 2. Waterproof Button Design, No Fear Of Wind And Rain! 3. The Latest Bluetooth V5.0 Chip, High-fidelity Stereo Sound, Clear, Stable And Continuous Calls; 4. Ultra-low Power Consumption, 19 Hours Of Continuous Music Playback (250mah Battery); 5. The Transmission Rate Is Fast And Stable, With An Unobstructed Transmission Distance Of More Than 20 Meters And Up To 50 Meters; 6. Built-in High-sensitivity Microphone And Equipped With Windproof Sponge Cover; 7. There Are Voice Prompts For Power On, Power Off, Pairing Success, Low Battery, Maximum Volume, Etc.; 8. The Ios System Can Display Battery Power And Activate Intelligent Voice Assistant; 9. It Can Be Used With Most Motorcycle Helmets On The Market And Can Be Diy Installed, Which Is Simple And Convenient. Parameter: Bluetooth Specifications: V5.0+//a2dp/avrcp/hfp Frequency Range: 2.4026ghz-2.480ghz Transmission Distance: More Than 20 Meters Sound Chan