DURAGADGET Premium Lightweight & Ultra-Portable USB-Powered Laptop Speakers with Volume Dial for Toshiba Satellite W30T-A-101, Toshiba CB35-A3120 Chromebook, Toshiba Satellite Pro C50-A-1KJ, Toshiba Satellite Pro C50-B-11L & Toshiba Satellite Pro C50-A-1KH 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%)