Yamaha PDX-31, 2.0 channels, 2 W, Red, Digital, 8 cm, 220 - 240 V Yamaha PDX-31. Audio output channels: 2.0 channels, RMS rated power: 2 W. Product colour: Red, Volume control: Digital, Driver unit: 8 cm. AC input voltage: 220 - 240 V, AC input frequency: 50 Hz. Width: 350 mm, Depth: 125 mm, Height: 109 mm. Compatible products: iPod, iPhone https://www.gadgetreview.com/yamaha-pdx-31-portable-dock-review ProsLittle to no sound distortion or interference One-size-fits-all for current iPods and iPhones; plus an AUX-in Crisp, clear audio presence at medium volumes ConsIsn’t actually “portable” with a 15-volt requirement Bass is present, but not impressive... Little to no sound distortion or interference, Onesizefitsall for current iPods and iPhones; plus an AUXin, Crisp, clear audio presence at medium volumes, Isn’t actually “portable” with a 15volt requirement, Bass is present, but not impressive, For $40 more, doesn’t improve much on PDX30