The Rolls PM55 personal amplifier mixes a stereo line-level monitor signal with a mic level XLR microphone signal to a set of headphones. Has monitor level control, mic level control, mic pass through XLR jacks, 2 headphone output jacks, and a stereo TRS 1/4" monitor input jack. The Rolls PM55 is great for drummers who need to hear a click track or backup singers who need to hear themselves.Mixes a stereo line-level monitor signal with a mic level XLR microphone signal to a set of headphones Monitor level control Mic level control Mic pass through XLR jacks 2 headphone output jacks Stereo TRS 1/4" monitor input jack