The 0-103704 from Visonic is a PowerG Wireless Door/Window Magnetic Contact. It protects common intrusion points such as windows and doors. It communicates with the security system, reporting openings and closings of doors and windows. This provides additional protection of property, with timely alerts, instantly when an intrusion attempt begins. with an exceptionally long-lasting battery, this magnetic contact delivers enduring security. The robust communication link enables long-range transmission and strengthens protection against interference. A convenient pull tab makes installation easy and fast.