DURAGADGET Portable USB Powered Speakers - No Mains Supply Required! For Toshiba Satellite NB10T-A-102 11.6" / Toshiba CB30-102 13.3&rdquo; Chromebook Active portable speakers, ideal for laptops Power supply via USB port (bus-powered) with a 3.5mm Jack Plug Volume control dial Frequency range: 320 Hz - 20 kHz Sine-wave power output: 2x 180 mW (total harmonic distortion &lt;3%)