Model: SK-0083BT Adopt excellent radio integrated circuit High sensitivity, bright sound Excellent permanent magnet speaker Built-in high-capacity lithium battery USB/TF MP3 playback (TF card not included) Bluetooth connection, cell phone calls Power supply mode: 1,Using lithium power supply (machine built-in lithium battery) 2,Usable 2 section 1 dry battery power supply Charging method: DC 5V input (DC: 5V IN) Product size: 161 * 60 * 95MM (manual measurement slight error)