Dahua DH-ARD2251E-W2 Wireless Triple-Tech Outdoor Detector with 15m Range, Anti-Masking & 40kg Pet Immunity

Product SKU: DH-ARD2251E-W2

Product Overview

The Dahua DH-ARD2251E-W2 is a wireless outdoor triple-technology detector designed for perimeter alarm protection around homes, businesses, storage areas and other exposed locations. It combines passive infrared and 24GHz microwave detection with optical anti-masking technology and intelligent processing to identify human movement in complex environments. The detector covers a specified 90° area at up to 15 metres when mounted at the recommended height, while three PIR sensitivity levels allow the response to be adjusted for the site. Pet immunity supports animals below 80cm and approximately 40kg, helping reduce nuisance alarms when installed correctly. Additional protection includes anti-masking, tamper alarm and movement detection if the device is shifted or detached. The IP66 housing supports wall or pole mounting, while AES128 encryption, frequency hopping and two-way wireless communication provide a reliable connection to a compatible Dahua alarm hub.

Key Capabilities

Best For

• Residential Perimeters: Monitors yards, side passages, gates and other exterior areas around a home.
• Pet-Friendly Properties: Supports suitable animals below the specified height and weight limits when installed correctly.
• Small Commercial Sites: Provides wireless outdoor detection around offices, shops, workshops and storage buildings.
• Anti-Tamper Applications: Detects masking, opening and physical movement or detachment of the installed detector.
• Video-Verified Alarm Systems: Supports an optional camera module where snapshots and visual alarm confirmation are required.

Why Choose the DH-ARD2251E-W2

The DH-ARD2251E-W2 provides more dependable outdoor protection than a basic single-technology motion detector by combining infrared, microwave and optical anti-masking functions. Its 15-metre coverage, three sensitivity settings and environmental temperature compensation help installers adapt detection to the site, while pet immunity can reduce nuisance alarms at suitable homes. Anti-masking, tamper and device-movement alerts add protection against interference, and the IP66 enclosure supports exposed installation. Long-range encrypted wireless communication also reduces the need for alarm cabling across yards or external structures. Available through Security Wholesalers, this detector should be selected after confirming the hub frequency, mounting height, protected area, pet behaviour and any optional camera or bracket requirements.

Buyer Decision Tips

Key Features & Technical Specifications

Model	DHI-ARD2251E-W2
Product Type	Wireless external triple-technology detector
Detection Technologies	Passive infrared, microwave, optical anti-masking technology and intelligent algorithms
Detection Mode	PIR and microwave confirmation
Microwave Frequency	24GHz
Detection Range	Up to 15m at a reference installation height of 1m
Detection Angle	90°
Detection Speed	0.3–2m/s
PIR Sensitivity	Three adjustable levels
Pet Immunity	Animals below 80cm and approximately 40kg
Anti-Masking	Supported
White-Light Resistance	10,000 lux
Temperature Compensation	Two-way digital temperature compensation
Environmental Monitoring	Environment temperature monitoring supported
Device Protection	Anti-masking, tamper alarm and movement or detachment detection
Low-Battery Detection	Supported
Indicator	One green alarm indicator
Controls	One power switch and one detection-range adjustment switch
Wireless Frequency	433.1MHz–434.6MHz
Wireless Distance	Up to 1,200m in an unobstructed open space
Communication	Two-way wireless communication with frequency hopping
Encryption	AES128
Transmitter Power	EIRP limited to 10mW
Remote Update	Cloud update with remote mobile-app updating, dual backup and automatic recovery after a failed update
Optional Video Verification	Supports the optional DHI-ARD1130-CAM infrared camera module
Power Supply	Four CR123A batteries
Battery Life Without Camera	Up to five years when triggering approximately ten alarms per day
Battery Life With Camera	Approximately 3.5 years when triggering alarms twice per week
Operating Current	20μA
Alarm Current Without Camera	26mA average and 250mA maximum
Alarm Current With Camera at Night	380mA average and 1.5A maximum
Installation Height	0.8–1.3m
Installation Type	Wall mount or pole mount
Protection	IP66
Casing Material	PC and glass fibre
Anti-Corrosion Level	Basic protection
Operating Conditions	−25°C to +60°C at 10%–90% relative humidity
Dimensions	211 × 106 × 94mm; dimensional drawing approximately 211.2 × 106.2 × 94.2mm
Weight	651g net and 890g gross
Packaging Dimensions	251 × 116 × 119mm
Certification	CE
Optional Accessories	DHI-ARD1130-CAM infrared camera module and ARA34E detector bracket

Ideal Use Cases

Choosing the Right Model

• Choose this detector if: You need 15-metre outdoor coverage, triple-technology detection, anti-masking and pet immunity up to approximately 40kg.
• Add the camera module if: Alarm snapshots and video verification are required through a compatible Dahua alarm system.
• Add the ARA34E bracket if: The intended wall or pole position requires additional aiming or mounting flexibility.
• Choose another regional variant if: The alarm hub does not operate within the confirmed 433.1–434.6MHz frequency range.

FAQs

1. What detection technologies does the Dahua DHI-ARD2251E-W2 use?
   The DHI-ARD2251E-W2 combines passive infrared and 24GHz microwave detection with optical anti-masking technology and intelligent processing. Dahua describes this combination as triple-tech detection. The detector is designed to confirm movement accurately while reducing interference from small animals, ambient temperature changes and changing light. Detection performance still depends on the correct mounting height, sensitivity setting, target path and site conditions.
2. What area can the DHI-ARD2251E-W2 detect?
   The detector provides a specified coverage angle of 90° and a range of up to 15 metres when installed at a reference height of 1 metre. Its supported installation height is 0.8–1.3 metres, and PIR sensitivity can be adjusted through three levels. The monitored area should be checked for walls, vegetation, reflective surfaces and other obstructions that could affect infrared or microwave performance.
3. How does the 40kg pet-immunity function work?
   Dahua specifies pet immunity for animals below 80cm in height and approximately 40kg in weight. This can reduce alarms caused by suitable pets moving through the protected area when the detector is installed and configured correctly. Pet immunity is not an absolute guarantee: animals climbing on furniture, walls or objects, moving close to the detector, or entering the detection zones at unusual angles may still trigger an alarm.
4. What do the anti-masking, tamper and moving-detection functions protect against?
   Anti-masking detection helps identify attempts to cover or obstruct the detector. A tamper alarm monitors unauthorised opening or interference, while moving detection is intended to identify when someone moves or detaches the device. These functions provide several layers of device protection, but their alerts must be enabled and correctly handled by the compatible Dahua alarm hub and notification configuration.
5. How far can the wireless signal reach?
   The detector communicates on 433.1–434.6MHz and has a specified RF distance of up to 1,200 metres in an unobstructed open space. It supports two-way communication, frequency hopping and AES128 encryption. Actual range can be substantially lower inside buildings or around metal structures, reinforced walls and radio interference, so the intended hub location and signal strength should be tested before final mounting.
6. How long do the batteries last in the DHI-ARD2251E-W2?
   The detector uses four CR123A batteries. Dahua specifies up to five years of battery life without a camera module when the detector triggers ten alarms per day. With the optional camera module, the stated life is approximately 3.5 years when alarms trigger twice per week. Actual battery life varies with signal strength, temperature, alarm frequency, video verification use and battery quality.
7. Can the wireless detector provide video verification?
   Yes. The detector supports installation of the optional DHI-ARD1130-CAM infrared camera module, allowing it to operate as a PIR-Cam for image and video verification through a compatible Dahua alarm system. The camera module is an optional accessory and is not part of the detector itself. Video-verification behaviour, snapshots and notifications depend on the connected hub, application setup and available network service.
8. What should be checked before ordering the DHI-ARD2251E-W2?
   Confirm that the compatible alarm hub uses the same 433MHz regional frequency, and check the 15-metre coverage, 90° angle, 0.8–1.3-metre installation height, wall or pole mounting method and expected pet movement. Also confirm whether the optional camera module or ARA34E bracket is required. Security Wholesalers can help verify the detector, hub and accessory combination before installation.

Additional Information

Dahua DH-ARD2251E-W2 Datasheet