Sony SRS-P11Q Passive Speaker System, White Pair of passive speakers for connection to a portable audio player Compact housing fits on a bookshelf, atop a dresser, or in a backpack 200 Hz to 10 kHz frequency response; requires no batteries 57 mm Damper-less neodymium magnets enhance audio performance 4 Watts maximum power (2 watts x 2); interchangeable white and silver faceplates