NOTE: THIS UNIT INCLUDES A 12V 3AMP POWER SUPPLY. Kinter's MA-170 mini amplifier is the new value leader in audio amplifiers, with 18 watts of robust power per channel and a stylish, modern appearance. The latest in IC-based amplifier technology delivers smooth, natural sound without fatigue or distortion, while running cool and drawing minimal power. The Kinter MA-170 is the real deal! You can use the MA-170 in a 2-channel home audio system, or build its capability into a portable unit that can be taken anywhere. RCA inputs and convenient spring terminal outputs will work with virtually any source and speakers to create a great sounding audio system. The black anodized aluminum housing's integrated mounting tabs make it easy to mount the amp anywhere. The glowing LEDs really set the mood for any music genre.Specifications: Power output: 2 x 18 watts Input impedance: 47K ohms Output impedance: 4 - 16 ohms Frequency response: 20 - 20,000 Hz Minimum THD: ≤0.02% Input voltage: 9 - 14.4 VDC Rated input current: 1A - 3A DC plug size: 2.1 mm x 5.5 mm DC input polarity: Center positive 12V 3A power supply included Dimensions: 4-7/8" L x 1-5/8" W x 4-5/8" D.