M7 Wireless Bluetooth Helmet Headphones

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1. Bluetooth version: 5.02. Frequency range: 2.402GHz-2.480GHz3. Transmission distance: about 20-30m4. Lithium battery capacity: 3.7V/500mAh5. Charging voltage: 5V6. Charging time: about 2 hours7. Standby time: about 360 hoursFeatures:1. Suitable for a variety of helmets2. With FM radio function, real-time control of road conditions3. Using Bluetooth 5.0 technology, wider cover...