Type: Bluetooth speakerConnection method: Bluetooth connectionInterface type: USBBattery capacity: 1500mahFrequency response range: 100HZ-20KHZOutput power: 5WSignal to noise ratio: ≥75dBPower supply mode: built-in lithium batteryChannel: 2.1Play time: 5 hoursExpansion storage: 32GBBluetooth protocol: 4.1Number of speakers: 1Effective distance: 10 metersFunction: drop-proof, waterproof, voice prompt, card insertion, radio, dustproof, call functionOperation mode: buttonPlay format: MP3, WMA, WAVShell material: plasticSpeaker adjustment method: button