Ajax DoorBell 66393.125.GR1 4MP AI PIR Video Doorbell Grey

Ajax DoorBell 66393.125.GR1 4MP AI Video Doorbell - Grey

The Ajax DoorBell 66393.125.GR1 in Grey combines a professional video surveillance camera, intelligent motion detection and a modern smart doorbell within the Ajax security ecosystem. Designed for residential entrances, apartments, offices, shops and commercial premises, DoorBell allows users to see visitors, communicate using two-way audio, monitor the entrance in real time and receive intelligent notifications when relevant movement or objects are detected.

This exact product is the Ajax DoorBell Grey, MPN 66393.125.GR1. It uses a 4MP CMOS camera with maximum 2688 x 1520 video resolution, HDR, an ultra-wide 155° horizontal viewing angle, Smart IR illumination, built-in artificial intelligence, a dedicated PIR motion detector, microphone and speaker for two-way voice communication and secure integration with Ajax apps.

Exact Grey Ajax DoorBell Variant

This listing is specifically for the Grey version of Ajax DoorBell. The product colour, MPN, barcode and other identifying information should remain consistent throughout the EKM product page, Merchant Center feed, image alt text and structured product data.

• Brand: Ajax
• Product: DoorBell
• MPN: 66393.125.GR1
• Colour: Grey
• EAN / GTIN: 4823114066160

Ajax DoorBell is also produced in other colours, including White, Graphite and Black. Those versions should be maintained as separate variants and should not be merged with this Grey product when building feeds or structured data.

4MP HDR Video up to 2688 x 1520

Ajax DoorBell contains a 4MP CMOS image sensor and supports main-stream video resolutions up to 2688 x 1520 pixels.

The maximum video resolution provides considerably more detail than standard 1080p doorbells, which can be especially useful when viewing visitors, parcels, vehicles or activity around the entrance.

Ajax also supports lower configurable resolutions including 2560 x 1440, 2304 x 1296, 1920 x 1080 and 1024 x 576. Video frame rate can be configured from 3 to 25 frames per second.

HDR processing helps improve detail where bright and dark areas appear simultaneously within the image, such as an entrance with strong daylight behind a visitor or a shaded doorway facing a brighter street.

Extra-Wide 155° Entrance View

The camera provides an exceptionally wide viewing area for monitoring the entrance.

• Horizontal camera viewing angle: 155°
• Vertical camera viewing angle: 90°

This wide field of view helps users see more of the area around the doorway rather than only the person positioned directly in front of the button.

Ajax also includes two wedge brackets in the standard package to help installers improve the camera position. One wedge can tilt DoorBell approximately 10° upwards or downwards, while the second can swivel it approximately 25° to the left or right.

Built-In AI Object Recognition

Ajax DoorBell uses built-in artificial intelligence to analyse objects appearing within the camera view.

The AI algorithms can distinguish between:

• People
• Animals
• Vehicles

This allows notifications and video events to be configured more intelligently than with basic pixel-change motion detection alone.

For example, a user may want to know when a person approaches the entrance while reducing unnecessary notifications from other movement. Detection behaviour remains configurable in Ajax apps according to the requirements of the property.

Dedicated PIR Motion Detection up to 4m

In addition to software image analysis, Ajax DoorBell contains a dedicated PIR motion sensor.

The PIR sensor provides a detection distance of up to 4m, depending on the configured sensitivity and installation conditions.

• PIR detection distance: up to 4m
• Horizontal PIR detection angle: 120°
• Vertical PIR detection angle: 100°
• Sensitivity levels: Low, Normal and High

Ajax can combine PIR detection with software image analysis. This provides installers and users with additional control over when motion and object notifications should be generated.

Smart IR Illumination up to 6m

For low-light and night-time entrance monitoring, DoorBell features Smart IR illumination with a specified range of up to 6m.

The infrared intensity is automatically adjusted in real time to help reduce excessive illumination on objects positioned close to the camera while maintaining visibility of subjects positioned further away.

This is particularly useful for doorbell installations because visitors may stand very close to the camera compared with a conventional CCTV installation.

Two-Way Voice Communication

Ajax DoorBell includes both a microphone and built-in speaker, allowing users to communicate with visitors directly through supported Ajax apps.

When someone presses the DoorBell button, the user can open the Ajax app, view the live camera image and communicate with the visitor without needing to physically answer the door.

Audio uses the G.722 codec together with always-active noise suppression and echo cancellation to improve voice communication around the doorway.

Live View from Ajax Apps

Users can access DoorBell video in real time from the Ajax ecosystem. Live viewing also supports digital zoom for closer inspection of the scene.

DoorBell can be added to an Ajax Space as a standalone Ajax video device. A separate Ajax security hub is therefore not mandatory simply to use DoorBell over Wi-Fi.

This is an important distinction from many traditional Ajax detectors that require a hub to operate.

2.4GHz Wi-Fi Connection

DoorBell uses Wi-Fi as its primary network connection.

• Wi-Fi standard: IEEE 802.11 b/g/n
• Frequency: 2.4GHz
• Maximum specified connection speed: up to 2 Mbit/s

Ajax DoorBell does not support 5GHz Wi-Fi. A stable 2.4GHz Wi-Fi signal should therefore be available at the intended installation location.

Optional Ajax Hub Backup Communication

DoorBell can also be paired with a compatible Ajax hub to provide an additional backup communication channel through Ajax Jeweller and Wings technologies.

Wi-Fi remains the primary channel for normal video operation. When integrated with a compatible Ajax security system, Jeweller and Wings can provide additional communication for alarms, events and supported visual verification functions.

This also allows DoorBell to become part of a wider Ajax intrusion, automation and monitoring solution rather than operating only as an independent smart doorbell.

Ajax NVR Recording

For local network video recording, DoorBell can be connected to an Ajax NVR on the same network.

An Ajax NVR enables access to recorded video archives through the Ajax ecosystem and can also support continuous 24/7 DoorBell recording when correctly configured.

This is important because continuous video recording is available through Ajax NVR storage rather than through the cloud archive.

Ajax Cloud Storage

Ajax's current DoorBell documentation also supports recording to the Ajax Cloud Storage archive according to the applicable subscription.

Cloud archive recording can provide convenient access to recorded event footage without requiring local NVR storage. However, continuous 24/7 recording is not available through Cloud Storage; continuous recording requires an Ajax NVR.

If DoorBell is used without an Ajax NVR and without an active Ajax Cloud Storage archive, the device can still be used for live viewing and visitor communication, but recorded video will not be stored.

ONVIF Support for Professional Video Integration

Current Ajax DoorBell firmware also adds ONVIF integration for professional video-management environments.

Ajax specifies ONVIF authorisation support on DoorBell with firmware version 2.377 or later. This can allow integration with compatible video management systems such as Milestone, Genetec, Axxon and Digifort when correctly configured.

This makes DoorBell useful not only for residential Ajax installations but also for more advanced professional surveillance projects where ONVIF-compatible video management is required.

JetSparrow Video Technology

DoorBell uses Ajax's proprietary JetSparrow peer-to-peer video protocol for fast encrypted video transmission within the Ajax video ecosystem.

Video uses H.264 compression, while Ajax apps provide access to live streams, archives, video walls and supported security scenarios.

Security and Tamper Protection

Ajax DoorBell includes physical and software security measures designed to protect both the device and its communication.

The SmartBracket mounting system includes tamper detection to notify the Ajax system if an attempt is made to remove the device from its mounting panel. A dedicated holding screw provides additional physical retention.

The product specification also includes encrypted mTLS communication, Ajax Cloud authentication, Secure Boot protection against unauthorised firmware and signature verification for secure over-the-air firmware updates.

External Power with Short-Term Battery Backup

Ajax DoorBell is designed to operate from an external wired power supply.

• DC supply: 12-24 V DC
• AC supply: 16-24 V AC, 50/60Hz
• Built-in battery: 600mAh rechargeable Li-ion

The built-in rechargeable battery should not be confused with normal battery-only doorbell operation. Ajax states that DoorBell is designed to operate using external power. The internal battery provides backup operation for short periods if external power is lost and also supports device heating in cold conditions.

The correct power supply capacity depends on the voltage, cable length and whether an existing wired chime is connected, so installers should follow the Ajax power-supply table rather than selecting a transformer solely from the nominal DoorBell power figure.

Works with Compatible Wired Chimes

The standard package includes Ajax BellKit, allowing DoorBell to be integrated with compatible wired mechanical or digital chimes.

When a wired chime is used, Ajax specifies higher power-supply requirements. For suitable installations, this allows the existing internal door chime to continue operating alongside smart notifications and video communication through Ajax.

IP54 Outdoor Protection

DoorBell has an IP54 enclosure protection rating and is designed for both indoor and outdoor use.

Ajax states that an additional weather hood is not required purely to protect the DoorBell from precipitation. However, the manufacturer does advise against positioning the device in direct sunlight because excessive heating can affect the electronic components.

• Protection class: IP54
• Operating temperature: -25°C to +60°C
• Operating humidity: up to 90%

Recommended Installation Height

Ajax recommends installing DoorBell approximately 1.2m to 1.5m above ground level.

Correct positioning helps achieve an effective camera view, PIR detection zone and convenient button height. The included wedge brackets can then be used to fine-tune the camera angle where the entrance layout requires it.

Ajax DoorBell 66393.125.GR1 Grey Product Facts

What Is Included with Ajax DoorBell?

• Ajax DoorBell
• SmartBracket mounting panel
• 2 x wedge brackets
• BellKit for compatible wired chime connection
• Installation kit
• Quick start guide

One included wedge bracket provides approximately 10° vertical adjustment, while the second provides approximately 25° horizontal adjustment.

Ideal for Homes and Businesses

Ajax DoorBell is suitable for residential homes, apartments, offices, shops, receptions, gated entrances and small commercial premises where video verification, visitor communication and intelligent entrance monitoring are required.

For existing Ajax customers, DoorBell can become part of the same security ecosystem used for intrusion detection, CCTV, automation and professional monitoring. For customers without an Ajax hub, the DoorBell can also be added to an Ajax Space and used as a standalone Ajax video device over Wi-Fi.

UK-Wide Ajax DoorBell Supply

We supply Ajax DoorBell video doorbells, Ajax alarms, CCTV equipment and related security products throughout England, Scotland, Wales and Northern Ireland, serving homes, installers and businesses across the United Kingdom.

For this product page, local coverage includes London, Romford, Ilford, Barking, Dagenham, Brentwood, Basildon, Chelmsford, Southend-on-Sea, Rayleigh, Wickford, Billericay, Grays, Thurrock, Harlow, Epping, Colchester and surrounding Essex and Greater London areas. Our wider Ajax security and CCTV supply service remains available throughout towns and cities across the rest of the UK.