Type: Bluetooth speaker Connection method: Bluetooth connection Interface type: USB Battery capacity: 1500mAh Frequency response range: 60HZ-20KHZ Output power: 5W Signal to noise ratio: 75dB Power supply mode : Built-in 18650 Channel: Mono Playing time: 6 hours Bluetooth protocol: 4.1 Number of speakers: 2 Effective distance: 10 meters Function: voice prompt, card insertion, radio, call function Working mode: button Display: None Playback format: MP3, WMA, WAV Shell material: plastic Support format: U disk TF card Speaker adjustment method: button Is there a radio function: Yes box: plastic Appearance size: 9x7.2x7 CM Product weight: 0.249 (KG) Packing list: a charging cable, an audio cable, a description, a machine Power mode: USB Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.