Connection mode: Bluetooth connectionInterface type: USBBattery capacity: 1200mAhFrequency response range: 100Hz-20KHzOutput power: 5W * 2Signal to noise ratio: ≥ 75dbPower supply mode: built in lithium batteryVocal tract: 2.1Playing time: more than 4 hoursExtended storage: 32GBBluetooth protocol: 4.1Number of horns: 2Effective distance: 10MFunctions: voice prompt, card insertion, radio, call function, wireless chargingOperation mode: key