The RTS16 window contact can be used to monitor the status of windows, doors or gates. A change in the status of the monitored object is transmitted both wirelessly and displayed by a two-colour LED. ON/OFF: When the contact is opened, an ON signal is sent. When the contact is closed, an OFF signal is sent. If the battery capacity is low, a BATTERY LOW signal is sent and the battery status is checked again every 2 hours.