<ul><li>Bluetooth version: 4.2V</li><li>Frequency range: 2.4-2.48GHz</li><li>Transmission distance: up to 10m</li><li>Faster transmission and lower power speaker diameter: ø6mm</li><li>Frequency response: 20-20kHz</li><li>Battery: Li-polymer (power bank 600mAh, earphones 55mAh)</li><li>Playing time: up to 10H with power bank box(2.5-4 hours*4)</li><li>Standby time: up to 120H</li><li>Charging time: 1.5-2H</li><li>Vibration alerts</li><li>IPx4 sweat-proof</li><li>Battery status display on Android/iOS</li></ul>