Frequency Response: 50Hz-12KHz.
Maximum Output Power: 10W Built-in.
Built-in Features: USB/SD.
Dimensions: 3-inch speakers.
Capsule Type: Condenser.
Output Impedance: 4ohm.
Power: 7V/1200 rechargeable Li-ion batteries.
Operating Temperature: -10 ~45.
Charge Time: 6-8 hours.
Continued use: 15-20 hours of rechargeable battery Operating Time (depending on the volume and environment temperature).
Power Specification: DC9V /250MA.