Check the listing for details. Rolls PM50S Personal Monitor Amplifier. Color: Black, Condition: New. Listed at 69.00 USD. The Rolls PM50s mixes a stereo line-level Monitor signal with a mic level XLR microphone signal to a set of headphones or earphones. It has a monitor level control, mic level control, mic pass through XLR jacks, two headphone output jacks, and a stereo TRS 1/4" monitor input jack. Possible users may be drummers who need to hear a click track, or choir singers who need to hear themselves. The power adapter is included.FeaturesXLR mic in and pass throughGround lift on XLR thruMono or stereo 1/4" monitor input1/4" and 1/8" headphone outsHigh output levelSpecificationsMax Input Level: -20 dB XLR, 40 dB monitorOutput Impedance: 10 OhmsGain: 15 dB 1/4", 50 dB XLRBandwidth: 20 - 20 kHzS/N Ratio: 90 dBPower: 9 - 18 VAC/DCDimensions: 3" x 2.5" x 1.25" (7.6 x 6 x 3.2 cm)Weight: 1 lb. (0.45 kg)