Selling Point: This product is a wireless intelligent door magnet with added reminders for unclosed doors and windows. It adopts an ultra-low power chip design, low voltage fault monitoring report, and anti disassembly and anti damage functions. Compatible with 1527 encoding format, optional oscillation resistor, and long transmission distance. Typical applications include anti-theft alarms for various household and commercial doors and windows. Parameter: * Battery: CR2032 (battery included)* Frequency: 433MHz * Encoding method: EV1527 * Transmission distance: 120M (in open space)