Dayton Audio DTA-100a Class-T Digital Amplifier 50 WPC (Black) (Discontinued by Manufacturer) Automatic switching 3.5 mm input jack allows you to select audio sources quickly Provides superb, audiophile-quality sound - less than 0.01% THD @ 30 watts 1/4&#34; headphone jack facilitates use as a high fidelity headphone amplifier Compact extruded aluminum housing with thick black anodized faceplate Short circuit, thermal, and overload protection ensures worry-free operation