The Crystal Monitor PSG Series is a Type II monitor that provides a convenient, accurate approach to diagnosing sleep disorders. Operating in the 2.4 GHz ISM band (Crystal Monitor 20-B) or the 900 MHz ISM band (Crystal Monitor 20-S), the systems offer advanced wireless data telemetry with a range of approximately 100 feet (30m)*. Small and untethered, the Crystal Monitor systems integrate the headbox, amplifiers, transducers and data telemetry into one handheld unit. Eliminating the need for separate amplifiers, cables and networking equipment allows for fast setup and rearrangement. The simplicity of the systems makes them uniquely suited for the traditional sleep lab, as well as non-traditional settings such as patient homes, hospital rooms, remote facilities, pre-surgical suites, nursing homes and sleep lab hotels.