Microlab B16 Stereo USB-Powered Speaker About B16: - Compact speakers for general music entertainment - Easy to install and use. - Ideal for most music or sound reproduction from your mp3 music file, or computer digital music file. - Master volume for additional level adjustment. Features: - Stereo speakers for computer, Mp3/Mp4, and iPod. - Light weight and compact design - 2" speaker drivers designed for full range resolution - USB powered, no battery needed - Connects to any 3.5mm stereo jack Specification: Output Power: 2.5 Watt x 2 Speaker: 2" x 2 F/R: 120 Hz - 20 kHz S/N: More then 65 dB Separation: More then 45 dB Dimensions (W x H x D): 89 x 89 x 67 mm What's in the box 1 x Microlab B16 Stereo USB-Powered Speaker