Ajax Door/Window Detectors

Ajax: DoorProtect and DoorProtect Plus

Manufacturer and Lineup

The "Door/Window Detectors" section presents two Ajax models — DoorProtect and DoorProtect Plus — from a company founded in 2011 in Kyiv by Aleksandr Konotopskyi, which over more than a decade has become Europe's largest security-system manufacturer, protecting more than 4.5 million people across over 180 countries.

Two Models, Different Protection Levels

DoorProtect is a wireless opening detector based on a reed switch (magnetic contact): one part mounts on the fixed frame of a door or window, the other on the moving leaf, and when they separate, the detector instantly sends a signal to the hub. The kit includes magnets of different sizes, allowing installation even on narrow frames or metal door frames, where a standard magnet wouldn't provide reliable contact.

DoorProtect Plus adds two extra sensors to the base functionality: shock and tilt. The shock sensor registers an attempt to force the door or break the frame without actually opening it, while the tilt sensor reacts to attempts to remove or dismantle the detector itself, or the door along with it — a protection level especially important for entry doors and gates, where intruders might try to bypass the contact detector without opening it directly.

Technical Advantages and Choosing a Model

Both detectors run on Ajax's own Jeweller protocol, providing stable radio communication with the hub over a considerable distance and energy efficiency sufficient for years of operation on a single battery without replacement.

Installing the detectors requires no wall chasing or cable runs — both parts mount with adhesive or screws directly onto the surface of the door, window, or frame, significantly simplifying installation compared to wired equivalents, especially in rented spaces or already finished renovations.

Compact dimensions and a neutral white housing let the detectors stay inconspicuous on a door frame or windowsill without disrupting interior aesthetics — a detail important for owners who don't want their security system to look like industrial equipment in a living space.

Ajax systems built on these detectors became the world's first wireless security system certified to the European EN 50131 standard's highest tier, Grade 3 — a mandatory requirement for sites with elevated security standards.

A status indicator built into the detector housing lets an installer immediately verify correct triggering during installation without needing extra test equipment — a practical detail that saves time when installing many points at a site with dozens of windows and doors.

Both detectors also transmit their own battery charge level to the hub, so the owner gets an advance notification about the need to replace the power cell, rather than discovering a dead battery only after the detector has already stopped working.

The choice between DoorProtect and DoorProtect Plus depends on the threat level at a specific site: interior doors or second-floor windows, harder for an intruder to reach, usually only need the base model; entry doors, gates, or ground-floor windows accessible from the street are worth considering with the Plus version's added protection against bypass attempts.

Opening detectors are usually combined with motion detectors to build multi-layered protection: the contact detector registers the actual opening event, while the motion detector confirms a person's presence in the room, together giving the hub and owner a fuller picture of the event.

Choosing specifically within the "Door/Window Detectors" section means comparing Ajax's products against other security-system manufacturers featured here on practical criteria: the presence of additional sensors (shock, tilt), compatibility with different door and window types, and the range and stability of radio communication with the hub.

We'll Help You Select a Model for Your Site

If your project requires reliable monitoring of doors and windows at a private home or office, Ajax's opening detectors deserve first consideration thanks to easy installation, energy efficiency, and the ability to choose a protection level for a specific entry point. Our consultants will help you select the specific model for your site, and our delivery service will get the chosen equipment to you promptly anywhere in Ukraine.