Time to market: 2015Model: Bluetooth speakerConnection mode: Bluetooth connectionInterface type: USBPower supply: built in lithium batteryChannel: 2.1+1Broadcast time: 6 hoursBluetooth protocol: 4.1Horn number: 2Effective distance: 10 metersFunction: the fall proof， dustproof， call function， card， voice prompts， radioOperation mode: the keyFor the crowd: GeneralDisplay: noShell material: MetalWhether APP: isFormat: support TF CardSpeaker: touch control modeMaterial: MetalSpecification: silver， black， gold， blueJUSS