Product information: Connection method: Bluetooth connection, U disk, SD card Interface type: USB Frequency response range: 100HZ-20KHZ Output power: 10W Signal to noise ratio: ≥85dB Power supply mode: built-in lithium battery Channel: 2.1 Play time: about 12 hours Expansion storage: 32GB Bluetooth protocol: 5.0 Number of speakers: 2 Effective distance: 10 meters Operation mode: button Applicable people: general Display: None Play format: MP3, WMA, WAV Shell material: metal + plastic Support format: U disk TF card Bluetooth Speaker adjustment method: button Box material: metal + plastic Color: blue sea blue, black starry sky Package: Manual warranty card, power cord, packing box, storage bag x1