Approx 21 multimedia mini speakers appsp21mw powered by usb 5v plug and play 21 stereo speakers 35mm audio jack connector power 5w 2 25w rms frequency 20hz 18khz the appsp21m is a compact speaker set with subwoofer 10 watt rms designed for those who want to enjoy their music with style its sleek slim design offer a modern touch to your computer and is ideal for both pc and laptop 21 stereo speakers the appsp21m is a set of speakers with a power of 5w subwoofer 2 25w and frequency ra