Overview The rolls PM351 is a handy utility device designed to make the lives of studio and stage musicians a little easier. The PM351 is a personal monitoring center that allows musicians and vocalists to monitor and control their own audio level against the entire mix. XLR microphone, 1/4" phone line and 1/4" phone instrument inputs are provided. Three volume controls provide control over the microphone signal, instrument signal, and line level signal. The 1/4" phone output and musician in recording and sound reinforcement scenarios. Polsen's HPC-A30 Closed-Back Studio Monitor Headphones are designed for audio monitoring in studio, field, mobile and DJ applications. They feature 50mm drivers that provide superior frequency response. from 18Hz to 22kHz for accurate reproduction of your audio. In the box Rolls PM351 Personal Monitor Station for Musicians PS27s 15 VDC 100 Wall Power Adapter. -240 VAC Polsen HPC-A30 - Closed-back studio monitor headphones 1/4" adapter