Function: Insert card, radio, TWS, voice prompt, call function Type: Bluetooth speaker Connection method: Bluetooth connection Interface type: USB Frequency response range: 100HZ-20KHZ Output power: 3W Signal to noise ratio: ≥ 70db Power Mode: Built-in lithium battery Channel: 2 Playing Time: 4 hours Extended Storage: 16 GB Bluetooth protocol: 5.0 Number of speakers: 1 Effective distance: 10 meters Operation method: button< /li> Applicable crowd: General Display: None Playback format: MP3 Shell material: metal < li>To support APP: No Supported format: TF card Speaker setting method: button Yes Does it have radio function: Yes Cabinet material: aluminum alloy Appearance size: length 85mm*width 85mm*height 37mm Product weight: 0.17 (KG) Packing list: Bluetooth speaker, charging cable, manual, packing box Source of power supply: USB Waterproof rating: not waterproof Built-in battery capacity: 300mA-500mA Battery capacity: 400MAH