NET MEDIA MICRO 40WDIG CLASS-D AUD AMP DIG CLASS-D AUD AMP It outputs 40 Watts (2 X 20W at 8 ohms) of power with low distortion (0.11% THD+N at 50% power) and a high signal to noise ratio (greater than 99dB). Its rugged aluminum case is very small and lightweight: 2.2 wide, 2.7 deep, 0.95 tall; 5.6 ounces. This amplifier provides great power in a tiny package yet it runs cool, green, and quiet without need of a fan at 92% efficiency. Enables computers, TV's, game systems, musical instruments, and portable media players (iPods, MP3/CD/DVDplayers) to drive audio through conventional floor, wall, bookshelf, or ceiling speakers.