Fangrui Product Details 1. Bt26 Outdoors Waterproof 500m Intercom Motorcycle Helmet Bluetooth Headset 2. 500m Intercom Range:advanced Intercom Functionality Allows Clear Communication Between Riders Up To 500 Meters Apart, Enhancing Group Ride Experiences. 3. Universal Helmet Compatibility:specially Designed To Fit Both Full-face And Half Helmets, Ensuring A Integration With Your Existing Motorcycle Gear. 4. Bluetooth-compatible 5.4 Technology:utilizing The Latest Bluetooth-compatible 5.4+edr, This Headset Offers Superior Signal Transmission, Ultra-low Power Consumption, And Compatibility With All Bluetooth-compatible Devices. 5. Auto-answer Functionality:featuring Automatic Call Answering, Allowing For Hands-free Operation To Maintain Safety While Riding. 6. Waterproof And Noise Reduction:built To Withstand Various Weather Conditions With Waterproof Design, While Noise Reduction Technology Ensures Clear Audio Even At High Speeds. 7. Enhanced Bass And Freeze Resistance:delivers Rich, Low-frequency Sound And Is Designed To Operate Efficiently In Cold Temperatures, Ideal For All-season Riding. 8. Specifications: 9. Bluetooth-compatible Version: 5.4+edr 10. Frequency Range: 2.402ghz-2.480ghz 11. Transmission Distance: 15-15 Meters (depending On The Device) 12. Microphone Transmission Distance: Less Than Or Equal 1m 13. Lithium Battery: 3.7v1000mah 14. Continuous Working Time: Less Than Or Equal 20 Hours 15. Charging Voltage: 5v 16. Charging Time: 3 Hours 17. Standby Time: Less Than Or Equal 80 Hours 18. Intercom Distance: 500 Meters 19. Bluetooth-compatible Name: Bt26