T4 Motorcycle Helmet Bluetooth Headsets BT 5.0 Stereo Automatically Connect to Support SIRI Product functions: 1. Connect to your mobile phone using the latest BT wireless technology. 2. Stylish design, enjoy wireless music anytime and anywhere. 3. Hands-free call function, truly free hands, to achieve safe riding. 4. Built-in 180mA rechargeable lithium ion battery to ensure standby time and working time. 5. 5.0 CSR BT chip, real hi-fi sound. 6. The battery level of the product is displayed on the phone. 7. DIY design, free disassembly. 8. You can easily set the prompt tone of the headset. Product parameters: 1. BT version: 5.0 2. Frequency: 2.402Ghz-2.480Ghz 3. BT distance: 10m~20m (depending on the surrounding environment of obstacles and other equipment) 4. Transmission distance of the microphone: ≤1m 5. Lithium ion battery: 3.7V 180mA 6. Broadcast time: ≤8 hours 7. Charging voltage: 5V 8. Charging time: ≤2 hours 9. Standby time: ≤160 hours 10. BT pairing name: T4 11. Packing list: Wireless headset, USB charging cable, user manual