ZZ Marts’ Sensors and Detectors category stocks magnetic door and window contact sensors (surface-mount and recessed NC types) that detect when an entry point has been opened, plus a wireless remote relay kit for pairing sensors with an alarm or automation system. These are a core building block of any burglar alarm or monitored security setup, alerting you the moment a door or window is opened. Pairs well with our Wireless Burglar Alarm System and Siren and Alarm Bells categories for a complete setup. Our Karachi and Lahore teams can help you plan sensor placement for full coverage of your property.