Preowned used only short time. For my moms Atrial Fibrillation detection and her sleep cycle. She is controlled already. So not needing this. Pet free and smoke free home Connect thru your phone. Can check the details on your phone. Featuring a simple one-time setup under the mattress, Sleep is a sensor that helps improve sleep quality by offering advanced sleep cycle analysis, heart rate tracking, and snore and breathing disturbances detection.