Function port description<br>1 power button / phone connection hang / pause / play button<br>2 volume key / next key<br>3 volume keys / a key<br>4 head hole<br>5 USB charging port<br>Product parameters<br>1, wireless transmission distance: CLASS<br>2, battery capacity: 180MAH<br>3, frequency range: 20-20KHZ<br>4, sensitivity: 95DB<br>5, impedance: 32 ohms<br>6, speaker size: 32MM<br>7, charging time: 2H<br>8, continuous voice call time: 4-6H<br>9, Bluetooth music playback time: 3-6H