DAHUA ARD821-W2(868) Wireless Panic Button
SKU: 3897831627

DAHUA ARD821-W2(868) Wireless Panic Button

$450000.00 $500000.00
Save 10%
No.2 Bestseller on ssadisability.org >

Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Jul 8 - Jul 13

Promo Codes Available:

For Your Every Summer RSVP, with Code: SUMMER15

Description

DAHUA ARD821-W2(868) Wireless Panic ButtonARD821 W2(868) Wireless Panic Button > Two way RF communication. > Provides multiple LED colors to indicate different statuses. > Cloud update and automatic recovery from update failure. > Offers accidental press prevention. > Battery life up to 5 years if used twice a week. > IP54 rated. Product Data Function Indicator Light 1 for multiple statuses (pairing, communication, and more) Remote Update Cloud update Button 1 Signal Strength Yes Low Battery

ARD821-W2(868)

Wireless Panic Button

> Two-way RF communication.
> Provides multiple LED colors to indicate different statuses.
> Cloud update and automatic recovery from update failure.
> Offers accidental press prevention.
> Battery life up to 5 years if used twice a week.
> IP54 rated.



Product Data

Function

Indicator Light

1 for multiple statuses (pairing, communication, and more)

Remote Update

Cloud update

Button

1

Signal Strength

Yes

Low Battery Detection

Yes

Battery Level Display

Displays battery level on app

Wireless

Carrier Frequency

868.0 MHz–868.6 MHz

Communication Distance

Up to 1,400 m (4,593.18 ft) in an open space

Communication Mechanism

Two–way

Encryption Mode

AES128

Frequency Hopping

Yes

General

Operating Temperature

–10 °C to +55 °C (+14 °F to +131 °F) (indoor)

Operating Humidity

10%–90% (RH)

Battery Model

CR2032

Battery Life

3 years (if used twice a week)

Product Dimensions

55 mm × 36 mm × 14.2 mm (2.17" × 1.42" × 0.56") (L × W × H)

Packaging Dimensions

95 mm × 59.5 mm × 30.5 mm (3.74" × 2.34" × 1.20") (L × W × H)

Installation

Wall mount; portable

Net Weight

18 g (0.04 lb)

Gross Weight

48 g (0.11 lb)

Certifications

CE

Casing Material

PC + ABS

Protection

IP54

Technical

Operating Current

28 mA

Test Mode

Yes
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 3897831627

Discover Niche Categories That Outsell

Top-Converting Item to Boost Your Average Order

4.6 ★★★★★
Based on 1157 reviews
Sort
Highest Rating
Newest First
Oldest First
Product Reviews
M
Verified Purchase
Max
Waukegan, US
★★★★★ 5
Quite literally my perfect water bottle
Color: Black Cherry, Size: 40 Ounces
This water bottle is perfect for me and is absolutely everything I wanted in a water bottle. Easy to clean, not too heavy and the handle makes it easy to carry around anyway, keeps water cold for a day but not much longer than that (but that's okay). I haven't dropped it yet so I don't know how well it'll hold up when I inevitably do but it seems plenty sturdy to handle it. I'm so excited about the color too because it's my favorite color and from what I can tell the dark cherry is an Amazon exclusive so I'm glad I found this. I love that it's still slender and can fit in standard cup holders while being a bigger bottle holding 40oz, which was my biggest priority. I've never had an Owala before so I wasn't sure what I'd think of the freesip mouth but I love it. I don't usually need to chug but having the option is nice too! If I ever need to replace this beauty I'll definitely get another Owala. I really could not ask for a more perfect water bottle. I don't even usually write reviews but I love this thing so much I just had to. I usually wouldn't spend this much on a water bottle but given all the praise I have for it the price is perfectly reasonable to me (and I try to be smart with money and responsibly pick when to spend more on something or be more frugal.) This is definitely worth the higher price than I have spent in the past on water bottles, and I'm pretty confident it'll last me a long time anyway, and I use it every single day too.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 26, 2026
J
Verified Purchase
Jilly Strasburg
Fort Morgan, US
★★★★★ 5
Best Water Bottle Ever!!
Color: Strawberry Fields, Size: 40 Ounces, Color: Strawberry Fields, Size: 40 Ounces
This is the greatest water bottle ever! I ended up buying 2 more after this. First, it's 40oz in a very easy to hold cup, that fits into car cup holders. It's leak proof which is amazing because every other bottle I've tried leaks in some way. You have 2 ways of drinking. You have the straw, and also the sip option. The handle is strong and sturdy. It locks to make sure it won't open on you on accident. Overall this is the greatest bottle I've ever had, and I'd highly recommend to anyone looking for a great bottle!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 2, 2026
E
Verified Purchase
Ellie Drew
Battle Creek, US
★★★★★ 4
Doesn’t leak, durable, keeps drinks cold
Color: Sparkling Sherbet, Size: 40 Ounces
Absolutely love this water bottle. I am a water bottle junkie and this one is my favorite. It doesn’t leak and the fact that I can guzzle or sip through a straw is a major plus. It is kind of heavy but it is a big thermos. The only reason I didn’t give five stars is because the bottom doesn’t fit in all cup holder. It keeps my drinks cold all day and is super easy to clean. It is very sturdy and well made. I figured after using for a while, the lid wouldn’t pop open as easy as it did when it was new, but it still does. I also love the lock feature incase the button accidentally gets pressed when I am carrying it around in my bag.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 11, 2026
E
Verified Purchase
Elizabeth Madrid
Lexington, US
★★★★★ 5
Great product
Style: Standard, Size: 3 Count
Title: Good product, worth buying “I’m happy with this purchase. The product arrived on time and was easy to use. The quality is good for the price, and it works as expected. I’ve been using it for a few days and haven’t had any major issues. There are a couple of small things that could be improved, but overall it does the job well. I would recommend it to others looking for a reliable option.”
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026
A
Verified Purchase
Anne L
Grantham, US
★★★★★ 5
A must have for great tasting water
Style: Standard, Size: 6
These Brita filters are a staple in my house. They’re super easy to swap out and start working right away. The difference in water taste is noticeable—no more chlorine or odd aftertaste, just clean, fresh water. I love buying the multi-pack because it lasts for months and saves me from constantly reordering. Each filter holds up well and keeps the water consistently tasting great. It’s also a great alternative to bottled water, which saves money and cuts down on plastic use. Simple, reliable, and totally worth it!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 11, 2026

recommand products

Creature Baekkel Big Game Deck 8.53"
75.95
Santa Cruz Embroidered Mesh Trucker Hat - Tonal Grey
28.00
Ricta Clouds Mojito Wheels 54mm/78a
42.95
Heroin Skateboards The Pickle Deck 12"
98.00
Carver 32.5" Black Tip V4 Surfskate Complete C7
139.50