Specification:

Speaker Unit: 36mm full range

Impedance: 4 ohm

Frequency Response: 100-16,000Hz

Maximum Output Power: 2W channel x 2=4W(RWS)

Output Connection: 3.5mm stereo plug

battery: 4x 1.5V AAA Battery or DC adaptor(not included) or USB Power Cord

Supported Formats: MPEG 1/2/2.5., Layer 3

Sampling Rate:32/44.1/48 KHz

S/N ratio: <90 dB(MP3)

Interface: USB 1.1

I/O Memory: SD/MMC card external memory