<p>Features:</p><p>Volume key: triple click the right headphone button to increase the volume, triple click the left headphone button to decrease the volume.</p><p>Charging indicator/charging completed indicator: headset indicator (red when charging, full charge off) charging box indicator (charging frequency indicator of charging box flashes, 100% full charge off).</p><p>The LED of the battery state during operation indicates that when the battery voltage is lower than 3.3V (the battery capacity is lower than about 15%), the red LED flashes, and there is a prompt tone. When the battery voltage is lower than 3.1V (the battery capacity is lower than about 5%), the system automatically shuts down.</p><p>Battery specification: lithium battery headset 40mah / charging box: 500mah.</p><p>Bluetooth version: 5.0</p><p>Support Profile: HSP, HFP, A2DP, AVRCP</p><p>Detection sensitivity: - 90dBm</p><p>Transmission Range (Hz)：2.40GHz~2.48GHz</p><p>Communication distance: ≥ 10m</p><p>Standby time: 7-8 days</p><p>Connected call time: 4H</p><p>The right time to play music: 4H</p><p>Charging time: 1.5-2H</p><p>Charging port: Type-c USB</p><p>Size: 80 * 60 * 31</p><p><br/></p><p>Packing included:</p><p>1* Headphone</p><p><br/></p><p><br/></p>