# Wireless Dual Microwave PIR Detector DAHUA ARD2251E-W2 868 – wireless motion detector, dual-technology (microwave + PIR), 868 MHz

**URL:** https://aio.lv/en/product--dahua-ard2251e-w2868--11636084
**Data updated:** 2026-03-10 09:09 (EET)
**Category:** Sensors & Detectors
**Manufacturer:** DAHUA
**Manufacturer code:** ARD2251E-W2(868)
**EAN:** 6923172509109
**Warranty:** 2 Years
**Availability:** Out of stock

## Summary description

DAHUA ARD2251E-W2 868 is a wireless dual-technology motion detector combining microwave and PIR sensors operating on the 868 MHz band. Designed for perimeter and indoor intrusion detection, it reduces false alarms by requiring both sensors to trigger. Suitable for integration with compatible alarm systems, it provides reliable motion detection for homes, offices and commercial premises.

## Long description

DAHUA ARD2251E-W2 868 is a wireless dual-technology motion detector that combines passive infrared (PIR) and microwave sensing on the 868 MHz frequency. Designed for perimeter and indoor intrusion detection, this detector requires simultaneous confirmation from both sensor types to register movement, which helps reduce false alarms caused by environmental factors. The device is compatible with alarm systems supporting 868 MHz wireless devices and is intended for reliable motion detection in residential, office and commercial environments.
Advantages
The combination of microwave and PIR sensing improves detection accuracy by validating movement across two independent technologies. Wireless operation on the 868 MHz band enables flexible placement without extensive wiring, and the compact housing simplifies installation in a variety of indoor and sheltered perimeter locations. The detector’s dual-technology approach provides improved immunity to pets, drafts and temperature changes compared with single-technology sensors, reducing unnecessary alarm events.
Suitable for
Perimeter protection for entrances, corridors and external sheltered passages
Indoor intrusion detection in homes, offices and small commercial premises
Integration with compatible 868 MHz wireless alarm control panels and receivers
Locations where reduction of false alarms is important due to environmental or animal activity
Key specifications
Detection technologies: microwave and passive infrared (PIR)
Operating frequency: 868 MHz (wireless communication)
Detection method: dual-technology logic requiring both sensors to trigger
Intended mounting: wall or corner mounting for perimeter and indoor coverage
Typical coverage: designed for short- to medium-range motion detection in sheltered locations
Power: battery-powered wireless operation (check compatible battery types and expected lifetime with system documentation)
Environment: for indoor use and sheltered outdoor locations; not designed for continuous outdoor exposure without protection
How to use
Mount the detector at the recommended height on a stable surface, oriented to cover the intended detection zone while avoiding direct exposure to heating sources, air vents or reflective surfaces that could affect the PIR or microwave sensors. Follow the alarm system manufacturer’s pairing procedure to enroll the device on the 868 MHz network, then perform an acceptance test to verify detection across the protected area. Adjust aiming or placement if the detector fails to reliably detect movement across the desired coverage.
Usage recommendations
For optimal performance, install the detector away from direct sunlight, heating units and large moving objects such as curtains or trees. When used in areas with pets or frequent environmental changes, position the detector and configure the system to balance sensitivity and false-alarm reduction. Consult the alarm control panel documentation for recommended placement, battery replacement intervals and specific enrolment steps for 868 MHz devices.

## FAQ

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All DAHUA products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized DAHUA service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

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