VESTA magnetic contact. Supervises the opening and closing of doors, windows, cabinets and drawers. Built-in extension terminal for greater flexibility in adding hardwired detectors. It works as a universal transmitter. Random supervisory signals to verify system integrity. The LED serves as a test and fault mode indicator. Via radio for easy installation. Wide range of RF communication and faster signal transmission. Protection against manipulation. Low battery detection. Meets CE requirement. EN50131 Grade 2 certificate. Environmental class II