Mini Door & Window - 319 SeriesELK-319DWMThe ELK-319DWM is a Supervised, Wireless Door Sensor that detects the opening and closing of doors or windows.This sensor is compatible with Elk?s 319MHz Receivers/Panels as well as many other panels that operate on the 319.5MHz Frequency and adhere to the ITI/Interlogix protocol.ELK-319DWMProduct DetailsFeatures:? Small, low profile design? Long range and battery life? Transmits open/close, tamper, low battery, and supervisory signals? Uses easy to find CR2032 batteriesGeneral InformationName: ELK-319DWM MINI DOOR & WINDOWCategory: Elk Products Inc., Intrusion & Smart Home, Intrusion Contacts, Overhead Door ContactsUPC Code: 762158190001Country of origin: Taiwan. Country of origin is subject to change.