Connection method: Bluetooth connectionInterface type: USBBattery capacity: 400MAHFrequency response range: 40Hz-20KHzPower supply: built-in lithium batteryPlaying time: 2-3 hoursBluetooth protocol: 4.2Effective distance: 10 metersFunction: waterproof, drop-proof, voice prompt, card, remote control, radio, dustproof, call function