AMC Optics 2.0 Speaker System - 6 W RMS - Black Unique space saving shape, built-in digital amplifier, and optimized equalization settings enhance your listening experience. Charging and playing capabilities for any model of iPod. Finer bass quality than other portable speakers 5.2W Loud and Clear sound Interchangeable faceplates for all iPod models Frequency Response 100Hz-20kHz Power Output: 5.2W (2X2.6W) Power Adapter: A/C 110v-240v (50Hz-60Hz) Power Supply: 9 VDC or 4 AAA batteries, Dimensions: 7 3/8in (L) x 1 7/8in (W) x 1 7/8in(H) Compatible with: iTouch series, iPod Classic, iPod Nano series, iPod Video 5G and series, iPod Photo, iPod Mini