Fangrui Product Details 1. Bt56 Rhythm Light Effects Motorcycle Helmet Headphone Bluetooth-compatible Music Headset 2. Bluetooth-compatible 5.4 Technology: Advanced Bluetooth-compatible 5.4 Technology Ensures Strong Signal Transmission, Low Power Consumption, And Compatibility With All Bluetooth-compatible Devices. 3. Automatic Call Answering: Supports Automatic Call Answering, Enhancing Safety And Convenience For Motorcycle Riders. 4. Long Battery Life: Enjoy Up To 20 Hours Of Continuous Working Time And Up To 80 Hours Of Standby Time. 5. Versatile Mounting Options: Comes With Both Clip-on And Magic Tape Mounting Bases For Easy Installation In Various Helmet Types. 6. Customized For Motorcyclists: Specially Designed To Fit The Internal Structure Of Both Full-face And Half-face Motorcycle Helmets. 7. Rhythmic Light Effects: Features Dynamic Light Effects To Enhance The Riding Experience And Visibility. 8. Specifications: 9. Bluetooth-compatible Version: 5.4+edr 10. Frequency Range: 2.402ghz-2.480ghz 11. Transmission Distance: 15-15 Meters (device Dependent) 12. Microphone Transmission Distance: Less Than Or Equal 1m 13. Battery: 3.7v500mah Lithium 14. 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. Bluetooth-compatible Name: Bt56