Product information:Function: Waterproof, dustproof, anti-drop, call functionType: Bluetooth speakerConnection method: Bluetooth connectionInterface type: USBBattery capacity: 500mAhFrequency response range: 40Hz-20KHzPower supply mode: built-in lithium batteryChannel: 2Playing time: 8 hoursBluetooth protocol: 4.1Number of speakers: 2Effective distance: 10 metersOperation mode: buttonPlay format: MP3, WMA, WAVShell material: metalSpeaker adjustment method: buttonBox material: metalAppearance size: MiniProduct weight: 0.195 (KG)Packing list :Bluetooth speaker X1