Dahua ARD821-W2 Wireless Panic Button

Overview

The Dahua ARD821-W2 is a small wireless panic button. One press sends an emergency alarm to a Dahua wireless alarm hub over two-way 433 MHz radio, and the hub can then sound sirens and notify users or a monitoring centre. It gives cashiers, receptionists, clinic staff, bank tellers and elderly residents a discreet way to call for help, and it can be carried, fixed under a desk or mounted on a wall beside a bed.

Is it right for you?

• Choose it for a till, reception desk, clinic, bank counter or the bedside of an elderly relative.
• It can be carried in a pocket or fixed to a wall or under a counter, so it suits both staff and residents.
• It needs a Dahua 433 MHz wireless alarm hub; it does not work on its own or with a wired panel.
• For a wired alarm panel, see the RC978 wired panic button instead.

Key features

• One large button with accidental-press prevention.
• IP54 rated housing, so it stands up to dust and splashes.
• Up to 1,300 m range in open space, with frequency hopping and AES128 encryption.
• Battery level shown in the app, with a low battery warning.
• Test mode and signal strength check for confirming coverage after fitting.
• Cloud updates through the hub.
• Compact at 55 x 36 x 14.2 mm and 18 g.
• One CR2032 coin cell, rated for about 3 years at two presses a week.

What else you need

A Dahua 433 MHz wireless alarm hub, such as the ARC3000H. The alarm response is configured in the Dahua app.

A CR2032 battery.

Installation

It can be wall mounted or carried. An alarm installer pairs it with the hub and sets the response.

Decide in advance whether a press should sound a loud siren or raise a silent alert; a silent panic alarm is often the safer choice at a till or counter.

Before you buy

Specified for indoor use from -10 to 55 °C.

Battery life depends on use; the 3-year rating assumes two presses a week.