This two way fully shielded stereo pair of speakers includes 1 active and 1 passive speaker. A 40W Class D amplifier is housed in the active speaker. The incorporated universal power supply means that the speaker can be used anywhere in the world without need for a change in voltage selection. OnOff switch is located on the rear panel. A blue LED lights above the volume knob when the system is on. The knob on the left hand front is a three position input selector for iPod, USB or 3.5mm jack plug input. The iPod dock is concealed on the top of the active speaker. It accepts iPod and iPhone and those devices will charge whilst in the dock. The USB connection is for direct link to a PC and is for playback use only. Cables are supplied for 3.5mm and USB connections together with a speaker cable to link the active and passive speaker. 145 x 200 x 240 mm WxDxH