Monoprice 615220 4-Channel Headphone Amplifier<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>35mm) amplified headphone outputs each with its own independent volume control</li><li>It features an extremely clean amplifier circuit which produces a signal-to-noise ratio greater than 98db</li><li>It accepts line-level audio input over the stereo RCA jacks on the back or headphone level through the optional 1/4 TRS jack</li></ul></div><img src="http://ecx.images-amazon.com/images/I/414CJpQmT5L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/413CefOw7CL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31RAxvJHr8L.jpg" noproxy>