<ul><li>Bluetooth version: 5.3</li><li>Transmission distance: 10m</li><li>Battery capacity: 400mAh</li><li>Frequency response:20Hz~20kHz</li><li>Sensitivity: 105±3db</li><li>Speaker diameter: 40mm</li><li>Call playback time: about 7-10 hours</li><li>Standby time: about 120h</li><li>Charging time: about 2h</li><li>Built-in microphone: YES</li><li>Usage mode:Bluetooth/TF card mp3 mode（Maximum Support 32g）</li><li>Charging voltage:5V-1A</li><li>Song switching: Support</li><li>Volume adjustment: Support</li><li>Answer the call/hang up the call: Support Audio I/O interface:Support</li></ul>