Note: Does not include any TF cardConnection method: Bluetooth connectionInterface type: USBFrequency response range: 100HZ-20KHZOutput power: below 10WSignal-to-noise ratio: ≥75dBPower supply mode: built-in lithium batteryChannel: MonoPlaying time: 1 hourExpandable Storage: 32GBNumber of speakers: 2Effective distance: 10 metersOperation mode: buttonApplicable people: generalDisplay: noneShell material: plasticWhether to support APP: NoSupported format: TF cardSpeaker adjustment method: buttonWhether there is a radio function: yesBox material: plasticAppearance size 200.5*41*63mmProduct weight 0.33 (KG)Power supply: USBgrade: not waterproofpacking list1*Bluetooth speaker UPC Does not apply Brand Unbranded Model Portable-Bluetoo.