The CA-2016 desktop 2-piece system comes in a compact and stylish design with convenient desktop control. The USB powered amplifier draws the power through a USB cable/plug. No batteries or AC power source are required. The stereo speaker system is magnetically shielded has a LED power indicator a cloth grill a volume control and a headphone output jack. Features:. Cable 6 ft Connectivity Technology. 2 x Speaker Speakers Details. 1.5" x 3" High Efficiency Drivers Driver Type. 4 Ohm Impedance. Magnetically Shielded Shielding. PC and Mac Platform Support. Volume - On On/Off Switch - On and LED Indicator - On Speaker . Headphone Jack On Speaker Interfaces/Ports. USB Power Source.