The PM55 from Rolls is a versatile personal monitor amplifier that allows a performer to hear their own signal along with a monitor or guide track. Perfect for singers, drummers and other musicians, the performer can connect their mic to the unit's XLR input and connect the monitor signal to the 1/4" input. Standard 3.5mm and 1/4" headphone jacks are provided to accommodate any type of headphone. Individual level controls for the mic and monitor allow the performer to select exactly how much of each sound source they're hearing. The amp can operate via battery or AC power for terrific versatility.