The Rolls PM55P Personal Monitor is the updated version of the PM55.  The redesigned chassis size, and layout also includes a built in switchable optical limiter.  Also added to the new design is a mic-line switch to the Mic Input in order to accommodate more applications, and all of the function adjustments are now switch activated instead of using bridge clips.  The new and improved PM55P looks better, has a limiter, and is more user friendly by accepting line or mic level inputs, making it the perfect monitor for personal use.  The PM55P also includes a belt clip, an dAC power adapter.