Wireless contact sensors use batteries and radio communication, so they typically mount without running cable and pair with a compatible alarm, automation, or monitoring system. Wired contact sensors connect through terminals and low-voltage cabling, which can require more installation time but lets the sensor communicate directly with a compatible control panel or input module.

Check that the contact sensor uses a communication protocol supported by your security or automation platform, pairs with the existing hub or panel, and supports the system’s expected contact type, such as wireless, magnetic, or an external wired input. Also verify mounting requirements, wireless coverage, tamper features, and whether the sensor suits the installation location, including recessed, indoor, outdoor, door, window, or gate applications.

Choose recessed contact sensors when you want the sensor and magnet installed inside a door frame or windowsill, provided the frame can accommodate the required openings. Choose surface-mounted sensors for installation alongside a door or window frame, and choose outdoor contact sensors for exterior doors or gates exposed to changing environmental conditions.

When comparing contact sensors, review tamper protection, battery-powered operation, external input terminals, wireless range, mounting style, and compatibility with the security or automation platform. For outdoor doors or gates, also check environmental durability, magnet gap, and mounting options, while recessed models may require specific frame dimensions and installation depth.