Door sensor for alarm

Suggestions for Door sensor for alarm
Energizer A23/E23A 12 Volt Alkaline Battery Pack of 2 - Capacity of 55mAh - Suitable for headsets, toys, electronics, medical devices & more.
Energizer A27 12V alkaline batteries, pack of 2, are long-lasting, reliable power sources for small devices. These high-performance batteries deliver consistent voltage and energy to keep your devices running smoothly.
Compact white wireless door/window sensor runs on a single CR2032 battery and uses 433 MHz technology to transmit contact status directly to your alarm system. It’s plug‑and‑play with no remote control required.
No monitoring fee: No hidden costs and no contract - Easy set up: Wire free for quick and easy installation - Expandable: Add up to 20 accessories to customise your system - Battery powered: No wires, no hassle and easy to replace - Convenient setting tim
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