The Sleepvirtual BWMini HST Compass is a polysomnography type 3 and 4 device. Intended to perform HST studies, the device contains 2x AC bipolar channels, pressure transducer, integrated RIP interfaces, oximeter, integrated body position, and DC channels. All of these resources embedded into a single module that will fit on the patient’s chest. It has an ability to monitor the traces and study information on the screen and a micro SD card (32 gb) with the capability of recording multiples studies.