M55  Personal Monitor System
The PM55 is designed for performers who need to monitor their own signal, such as their vocal, with the main mix. The unit has become very popular with drummers who need to mix a click with a monitor signal. And many sound technicians use the PM55 as a quick line tester to troubleshoot audio systems. Operates on either one 9 volt battery (alkaline preferred) or the included PS27s power supply. The PM55 also has an included belt clip.

PM55
    XLR Mic In & Pass Through
    Ground lift on XLR signal
    Stereo/Mono 1/4" Monitor Input
    3.5mm and 1/4" Headphone outputs
    Powered by one 9 volt battery or the included PS27s power supply
    Lots of output level, it's loud
    Belt clip is included

Specifications
    Max Input Level: -20 dB XLR, 40 dB Monitor
    Input Impedance: 600 Ohm Mic, 22k Ohm Monitor
    Output Impedance: 10 Ohms
    Gain: 15 dB 1/4", 50 dB XLR
    Bandwidth: 50 Hz - 20 kHz
    S/N Ratio: 90 dB
    Power: 9 - 15 VDC
    Size: 3" x 2.5" x 1.25" (7.6 x 6 x 3.2 cm)
    Weight: 1 lb (.45 Kg)
    Current drain 60ma nominal no load 15vdc

 And many sound technicians use the PM55 as a quick line tester to troubleshoot audio systems. Operates on either one 9 volt battery (alkaline preferred) or the included PS27s power supply. The PM55 also has an included belt clip.