Product information: Function: card, radio, voice prompt, call function Type: Bluetooth speaker Connection method: Bluetooth connection Interface type: USB Battery capacity: 1400 mAh Frequency response range: 100HZ-20KHZ Output power: 3W Signal to noise ratio: ≥75dB Power supply mode: built-in lithium battery Channel: 2 Play time: 4 hours Expansion storage: 32GB Bluetooth protocol: 4.1 Number of speakers: 2 Effective distance: 10 meters Operation mode: button Display: Yes Shell material: plastic Support format: TF card Speaker adjustment method: button Is there a radio function: Yes Box material: plastic Product weight: 0.35 (KG) Power supply mode: USB Size information: Appearance size: 13.9*6.8*4.5CM Packing list： manual X1 charging cable X1 machine X1