Bluetooth 5.1 Round Wire Neck-mounted Bluetooth Sports Earphone with Magnetic Function 1. Bluetooth 5.1 chip, intelligent noise reduction, high-definition call. 2. The treble is bright, the midrange is real, and the bass is strong, giving you a shocking experience. 3. Three-key line control, switching only takes a moment. 4. 100mAh battery, low power consumption, long battery life, to meet your outdoor needs. 5. Suitable for various environments, easy to deal with rainsweat, runningfitness You can bring it. 6. The design of 360-degree azimuth fits the inclined surface of the ears, which is comfortable to wear and painless after long-term wear. 7. Intelligent magnetic attraction, anti-winding and anti-loss. Product parameters: 1. Bluetooth version: 5.1. 2. Drive unit: Graphene 10mm speaker. 3. Impedance value: 16 ohms. 4. Sensitivity: 92dB. 5. Frequency range: 16Hz-25KHz. 6. The weight of a single headset: 9.2g. 7. Battery capacity: 100mAh. 8. Standby time: about 10 hours. 9. Sound effect: 4D.