Alarm

The Dahua DHI-ARD912-W2(D) is a wireless water-leak detector for the Dahua AirShield alarm system. Place it on the floor by a washing machine, dishwasher, hot-water unit or under a sink and it raises an alarm the moment water reaches its probe, so you catch a leak before it does real damage. This (D) version has an adjustable-height probe, so you can set how deep the water has to pool before it alarms, and the casing is IPX5 water-resistant. It links to your AirShield hub over an encrypted two-way RF connection. An AirShield hub is required and sold separately.

Key points
- Alarms as soon as water reaches the probe
- Adjustable-height probe sets the trigger depth and sensitivity
- IPX5 water-resistant casing; no wiring, easy to place
- Encrypted two-way RF link with frequency hopping and jamming detection
- Ambient temperature display and overheat alarm
- CR123A battery, around 3 years; indoor; requires an AirShield hub

The Dahua DHI-ARM320-W2 is a wireless input expander for the Dahua AirShield alarm system. It lets you connect an existing third-party wired detector — a PIR, reed, smoke or panic device — and bring it into your wireless alarm, so when that detector triggers, the expander reports it to the hub over the air. It can even supply low-voltage power to the connected detector, and it runs for years on its own batteries. An AirShield hub is required and sold separately.

Key points
- Connects a third-party wired detector to the Dahua AirShield wireless system
- One alarm input plus a second input for the detector's tamper port
- Six alarm types selectable in the app: intrusion, medical, fire, emergency, gas, tamper
- Auxiliary 3.3 V output (up to 10 mA) to power the connected detector
- Encrypted two-way wireless (AES128, frequency hopping), up to 1,300 m
- Triaxial accelerometer for a device-moved alarm; tamper protection
- 4 x AA batteries for around 3 years of life; indoor; requires a Dahua AirShield hub

The Dahua DHI-ARC3800H-FW2 is the Alarm Hub 2, the brain of a Dahua AirShield wireless alarm system. It manages your wireless detectors, sirens, keypads and keyfobs, decides when to raise an alarm, and notifies you through the free DMSS app. It connects three ways — Ethernet, Wi-Fi and 4G cellular — so it keeps reporting even if one network drops, and a built-in rechargeable battery keeps it running through a power cut. Wireless peripherals are required and sold separately.

Key points
- Central hub for the AirShield system; up to 150 wireless and wired peripherals across 32 areas
- Triple connectivity: Ethernet (RJ45), Wi-Fi and 4G cellular (dual SIM) with multi-network redundancy
- Built-in 4,750 mAh battery for around 12 hours of backup during a power cut
- 868 MHz two-way radio to peripherals with AES128 encryption and frequency hopping
- Alarm video verification from up to 8 IP cameras; SMS and phone-call alerts to 12 numbers
- Self-monitor free in DMSS with no monthly fees, or link to a monitoring centre (SIA / SoftGuard)
- Arm by app, keypad, keyfob, card, SMS or schedule; wireless peripherals sold separately

The Dahua DHI-ARM310-W2 is a wireless input expander for the Dahua AirShield alarm system. It takes a single wired detector — one that only comes in a hard-wired form, or an existing wired sensor you want to keep — and reports it to the hub wirelessly, so you can fold a wired device into an otherwise wireless system without running cable back to a panel. It links to the hub over an encrypted two-way RF connection and runs on a battery. An AirShield hub is required and sold separately.

Key points
- Converts one wired (NO/NC) detector input into an AirShield wireless zone
- Reports six alarm types: intrusion, medical, fire, emergency, gas and tamper
- Encrypted two-way RF link with frequency hopping; signal-strength check
- Ambient temperature monitoring and low-battery alarm
- 4 x AA batteries for around 3 years (NO input) or 2 years (NC/pulse)
- Indoor, bracket mount; requires a Dahua AirShield hub

The Dahua DHI-ARD822-W2 is a dual-button wireless panic button for the Dahua AirShield alarm system. It needs both buttons pressed together to raise an alarm, which makes accidental activation far less likely — ideal for busy counters, schools or anywhere a single button could be knocked. The alert goes to your AirShield hub and your phone. It is IP54 rated, battery powered, and links to the hub over an encrypted 868 MHz two-way connection. An AirShield hub is required and sold separately.

Key points
- Two buttons pressed together raise the alarm — strong false-alarm prevention
- 868 MHz two-way radio with AES128 encryption and frequency hopping
- Range up to 1,200 m in open space to the hub
- IP54 rated; multi-status LED with battery level in the app
- CR2032 battery, around 3 years; wall-mount or portable
- Requires a Dahua AirShield hub

The Dahua DHI-ARM7011-W2 is a wireless relay for the Dahua AirShield alarm system. It gives the system a switched, isolated dry contact (0-36 VDC, up to 5 A) that you can trigger from the app, on a schedule, in a scene, or automatically when an alarm event happens — handy for switching a light, a gate or garage trigger, or an extra warning device. It links to the hub over an encrypted two-way radio link and has overheat and overvoltage protection built in. An AirShield hub is required and sold separately.

Key points
- One isolated dry-contact relay output, 0-36 VDC, up to 5 A
- Trigger from the app, a schedule, a scene or an alarm event
- Encrypted two-way radio with AES128 and frequency hopping; range up to 800 m
- Overheat and overvoltage protection; one tamper input
- Powered from 7-24 V DC; compact wall mount
- Requires a Dahua AirShield hub

The Dahua DHI-ARA43-W2 is a wireless alarm repeater for the Dahua AirShield system. It sits between the hub and your detectors and sirens, forwarding their signals to extend wireless coverage and remove blind spots in larger or awkward buildings. It supports up to 128 peripherals at up to 1,600 m in open space, switches automatically between dual antennas for a reliable link, and has a built-in battery that keeps it working for over 35 hours through a power cut. An AirShield hub is required and sold separately.

Key points
- Extends the hub-to-peripheral range up to 1,600 m in open space
- Provides a second path for up to 128 wireless peripherals
- Automatic dual-antenna switching to reduce signal blind spots
- 868 MHz two-way radio with AES128 encryption and frequency hopping
- Built-in lithium battery, over 35 hours of backup in a power cut
- Tamper alarm and external-power loss detection; needs an AirShield hub

The Dahua DHI-ARD912-W2 is a wireless water-leak detector for the Dahua AirShield alarm system. Place it on the floor by a washing machine, dishwasher, hot-water unit or under a sink and it raises an alarm the moment water reaches its sensor, so you catch a leak before it does real damage. Sensitivity is adjustable to suit the spot, the casing is IPX5 water-resistant, and it links to your AirShield hub over an encrypted 868 MHz two-way connection. An AirShield hub is required and sold separately.

Key points
- Alarms as soon as water reaches the sensor
- Adjustable sensitivity to suit the location
- IPX5 water-resistant casing; no wiring, easy to place
- 868 MHz two-way radio with AES128 encryption and frequency hopping
- Range up to 1,200 m in open space to the hub
- Temperature display and overheat alarm; CR123A battery, around 3 years