Type: Bluetooth SpeakerConnection method: Bluetooth connectionInterface type: USBBattery capacity: 300mahFrequency response range: 100HZ-20KHZOutput power: 3wSignal to noise ratio: ≥75dBPower supply: built-in lithium batteryChannel: 2.1 + 1Duration: 6 hoursExtended storage: not supportedBluetooth protocol: 4.1Number of speakers: 1Effective distance: 10 metersFunction: waterproof, voice prompt, dustproof, call functionOperation method: buttonPlayback format: MP3Shell material: plasticSpeaker adjustment method: buttonAppearance size: 98 * 88 * 43mmPower mode: USBColor: blue, yellow, black, red, green