Features:

1) Volume control by VR at back

2) No need driver for all operation systems

3) Compliant with USB v1.0 audio device	

4) Frequency response: 150Hz - 20kHz

5) Power output: 0.4W x 2 (RMS)

6) Power consumption: 5V, 450mA

7) Compatibility: Win' 98 SE / ME / XP, Mac OS 9/OS X

8) Product size (W x H x D): 160 x 60 x 28mm

9) Weight: 155g