Door Window Magnetic Sensor Alarm Burglar Security System for Smart Home This is a program model magnetic alarm with an indicator light. After the magnetic strip is separated, it will make alarm sound 20 seconds. After 20 seconds, the magnetic strip will be closed and then stopped for 20 seconds. If the magnetic strip is closed within 20 seconds of the alarm, the alarm will stop after 20 seconds. Understood as: in the armed state and the alarm is not on, no matter the magnetic strip is separated or closed, the alarm will make sounds for 20 seconds as long as it is triggered, until the power switch is turned off. Features: The shell is made of ABS plastic with matte finish and high-end atmosphere. The components are processed by 5M chip to avoid the conceal danger of manual welding. 130db super loud sound, effectively frighten the thieves. Circuit optimization and low-consumption design, the board will not be burnt, which makes it work for a long time, Adopt powerful magnet, the magnetic force is strong and never degaussing. It will alarm with loud sound when the sensor detects someone come in which can warn you and scare burglar away. Start-up with delay function, 10 seconds delay, easy to withdraw from the defense area. With indicator light to display alarm status and low power. Alarm for 20 seconds, play an alarm role as well as saving enegy. When the battery power is low, the alarm squeaks and the red light turns on. At this time, the battery needs to be replaced. Specification: Housing Material: ABS Color: White Power Supply: DC 9V Battery Alarm Volume: ≥120DB Package Weight: approx.56g Application: sliding doors, courtyard doors, anti-theft doors and windows Package list: 1 * Magnetic Door Alarm 2 * Sticker