Internal inclusion： Whether there is function: Yes Type: Bluetooth speaker Playback duration: 3 hours Extended storage: 16GB Power supply mode: built-in lithium battery Function; Plug in card, , call function 1PC charging line Bluetooth protocol: 5.0 material: 5. Bluetooth will automatically shut down within ten minutes without operation, saving power and worry Channel: 2.1 1.8W high-power speaker, outstanding bass Playback format: MP3 Operation mode: press key Speaker adjustment mode: key Applicable population: Frequency response range: 280hz-16khz Interface type: USB 3. Independent antenna enhances the signal effective distance up to 10 Effective distance: 10M 1PC speaker 2. Form independent left and right channels to achieve 360° stereo sound Number of speakers: 1 Connection method: Bluetooth connection Output power: 3W Supported format: Support app: no Display: None 4. The signal is the wireless transmission is more stable and the call is clear and stress- Desktop Computers Speakers Sound Bar 700 Rear Speakers