ขาย ระบบเซนเซอร์แม่เหล็กระบบเตือนภัยรักษาความปลอดภัยสําหรับระบบรักษาความปลอดภัย ราคาที่ดีที่สุด

Door and window alarm helps deter intruder/thieves effectively by 108dB loud alarm, also can be door open chime help notify you if children/pet or others are coming/ going Magnetically triggered door alarm sensor suitable for Doors, Windows, Sliding Door/ Window, Freezers and Refrigerators General Alarm, Constant Alarm, Time Delay(Closing-door Alert ), Doorbell 4 in 1 Multi-Function, you can set the appropriate e according to your need Easy to press off/on button to power off/on when you don't wanna to hear any sounds of this door alarm or when you need it Simple peel and stick installation & Low consumption design, they can work for over 2 years Product Feature 4 in 1 Multi-Function --- General Alarm, Constant Alarm, Closing-door Alert (Time Delay), Doorbell, set the appropriate e according to your need. Battery Operated, it need two AAA alkaline batteries ( not included ). Low Battery Warning, when it need replace batteries, the LED light will flash once every second. Self-Adhesive, easy to install and operate. Constant Alarm e Press constant alarm button once to power on and enter the corresponding e. It al at least 30 seconds when triggered. Closing-door Alert e/Time Delay e Press closing-door alert button once to power on and enter the corresponding e. It sounds "di-di-di" when doors/windows opened 5 seconds later (Can set the delay time 2/5/10/20 seconds, the factory default is 5s). Stops when they are closed. It wouldn't beep when the door/window was immediately opened. Doorbell e Press doorbell button once to power on and enter the corresponding e. It sounds "Dingdong" when doors/windows are open. color: White Material: ABS Package Contents: 1 * Door/window Alarm 1 * Magnet BoxOnly the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.