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Dahua · Alarms

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

Model / SKU: DH-ARD2251E-W2

Dahua DH-ARD2251E-W2 Wireless Triple-Tech Outdoor Detector with 15m Range, Anti-Masking & 40kg Pet Immunity. Dahua Wireless Triple-Tech Outdoor Detector | DH-ARD2251E-W2 | 15m Range | Anti-Masking | 40kg Pet Immunity | Wireless Alarm Detection The Dahua DH-ARD2251E-W2 delivers a wireless triple-tech outdoor detector designed for compatible Dahua alarm systems requiring reliable perimeter and outdoor motion detection. Featuring a 15m detection range, anti-masking support and 40kg pet immunity, it helps monitor outdoor areas while reducing unwanted alerts from suitable pet movement and interference attempts. It also supports wireless alarm integration, making this detector available at Security Wholesalers practical for homes, yards, entrances, sheds, small businesses and perimeter security applications. Its outdoor detector design suits locations where motion sensing, pet-tolerant performance and added tamper awareness are important for a more complete alarm setup. Key Features Triple-Tech Detection: Supports more reliable outdoor motion detection for compatible Dahua wireless alarm systems. 15m Detection Range: Provides practical coverage for suitable yards, entries, perimeters and outdoor alarm zones. Anti-Masking Support: Helps detect attempts to obstruct or interfere with the detector in supported installations. 40kg Pet Immunity: Helps reduce unwanted alerts caused by suitable pet movement in monitored outdoor areas. Wireless Alarm Integration: Connects with compatible Dahua wireless alarm environments for flexible deployment. Outdoor Security Use: Suits homes, small businesses, sheds, yards, gates and perimeter protection applications. Additional Information Dahua DH-ARD2251E-W2 Datasheet 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 Triple-Technology Detection Passive infrared, 24GHz microwave and optical anti-masking technologies work with intelligent algorithms to provide accurate outdoor movement detection in changing environmental conditions. 15-Metre Outdoor Coverage The detector provides a specified 90° coverage angle and a range of up to 15 metres when installed at a reference height of 1 metre. Anti-Masking and Tamper Protection Anti-masking detects attempts to obstruct the sensor, while tamper and movement detection help identify opening, relocation or detachment of the device. 40kg Pet Immunity Pet immunity supports animals below 80cm and approximately 40kg, helping reduce unwanted alarms caused by suitable household pets. Optional Video Verification The optional DHI-ARD1130-CAM infrared camera module can convert the detector into a PIR-Cam for alarm snapshots and video verification through a compatible system. Encrypted Long-Range Wireless Two-way communication, AES128 encryption and frequency hopping support reliable operation at up to 1,200 metres in an unobstructed open environment. 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 Frequency and Hub Tip: The detector operates from 433.1MHz to 434.6MHz. Confirm that the selected Dahua alarm hub uses the matching regional frequency before ordering, as visually similar wireless alarm products may operate on another band. Pet and Placement Tip: Pet immunity depends on correct installation and scene design. Avoid locations where animals can climb close to the detector or move through higher detection zones, and mount the unit between 0.8 and 1.3 metres. 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 Side Passages Monitors narrow exterior access routes where movement should be detected before a person reaches the building. Driveways and Gates Provides wireless detection around pedestrian gates, vehicle approaches and external property entrances. Backyards Supports pet-aware motion protection around outdoor living areas, sheds and rear access points. Small Commercial Yards Adds outdoor alarm coverage around workshops, offices, storage buildings and loading areas. Vandal-Prone Locations Anti-masking, tamper and device-movement alerts help identify interference with an accessible detector. Video-Verified Alarm Zones Add the optional infrared camera module where visual confirmation of alarm events is required. 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 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. 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. 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. 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. 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. 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. 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. 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. 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Additional Information Dahua DH-ARD2251E-W2 Datasheet