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frontpageTattyBear | Staff posted Nov 17, 2025 10:39 PM
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frontpageTattyBear | Staff posted Nov 17, 2025 10:39 PM

2-pk Ring Alarm Contact Sensor (2nd Gen)

$16

$40

60% off
Amazon
13 Comments 3,757 Views
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Deal Details
Amazon has 2-pk Ring Alarm Contact Sensor (2nd Gen) on sale for $15.99. Shipping is free with Prime or on $35+ orders.

Thanks to Deal Hunter TattyBear for finding this deal.

About this product:
  • Contact sensor for Ring Alarm systems, sends instant alerts when doors or windows open
  • Compact design installs easily with no tools required
  • Includes two 3V CR2032 batteries with up to 3-year battery life
  • Operates indoors from 32°F to 120°F; 1" max sensor spacing
  • Z-Wave connectivity with 250' open-air range; requires Ring Alarm Base Station

Editor's Notes

Written by megakimcheelove | Staff

Original Post

Written by TattyBear | Staff
Product Info
Community Notes
About the Poster
Deal Details
Product Info
Community Notes
About the Poster
Amazon has 2-pk Ring Alarm Contact Sensor (2nd Gen) on sale for $15.99. Shipping is free with Prime or on $35+ orders.

Thanks to Deal Hunter TattyBear for finding this deal.

About this product:
  • Contact sensor for Ring Alarm systems, sends instant alerts when doors or windows open
  • Compact design installs easily with no tools required
  • Includes two 3V CR2032 batteries with up to 3-year battery life
  • Operates indoors from 32°F to 120°F; 1" max sensor spacing
  • Z-Wave connectivity with 250' open-air range; requires Ring Alarm Base Station

Editor's Notes

Written by megakimcheelove | Staff

Original Post

Written by TattyBear | Staff

Community Voting

Deal Score
+18
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Price Intelligence

Model: Ring Alarm Window and Door Contact Sensor 2-Pack (2nd Gen) in White | 4SD2SZ-0EN0

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Sort: Lowest to Highest | Last Updated 11/20/2025, 09:07 PM
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12 Comments

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Nov 18, 2025 03:25 AM
286 Posts
Joined Sep 2018
magiccdeal123Nov 18, 2025 03:25 AM
286 Posts
Can it work without subscription?
1
Nov 18, 2025 03:32 AM
7,442 Posts
Joined Nov 2010
MusicSharkNov 18, 2025 03:32 AM
7,442 Posts
Quote from magiccdeal123 :
Can it work without subscription?
Good question.
2
Nov 18, 2025 03:59 AM
953 Posts
Joined Sep 2007
liljay2kNov 18, 2025 03:59 AM
953 Posts
6 pack is $30 on Ring's website

edit: Try code: PROTECTPLAN on there too
Expert
This user is an Expert in Tech & Electronics
Nov 18, 2025 04:02 AM
18,820 Posts
Joined Sep 2011
bluekiwi
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This user is an Expert in Tech & Electronics
Nov 18, 2025 04:02 AM
18,820 Posts
Quote from magiccdeal123 :
Can it work without subscription?
Quote from MusicShark :
Good question.
Is a subscription needed?

Yes, the Ring Alarm Contact Sensor requires a Ring Protect subscription to get instant mobile alerts when doors and windows open.

The sensors themselves work with the Ring Alarm Base Station, but the notification features that alert you to activity require an active Ring Protect subscription, which is sold separately.
1
3
Nov 18, 2025 07:03 AM
18 Posts
Joined Nov 2020
VersatiliasNov 18, 2025 07:03 AM
18 Posts

Our community has rated this post as helpful. If you agree, why not thank Versatilias

Quote from magiccdeal123 :
Can it work without subscription?
It works without a subscription. I have these connected to home assistant.

You do need to buy a z-wave usb stick to connect the sensor to home assistant.
1
Nov 18, 2025 01:11 PM
80 Posts
Joined Feb 2009
Mawk1Nov 18, 2025 01:11 PM
80 Posts
Quote from liljay2k :
6 pack is $30 on Ring's website

edit: Try code: PROTECTPLAN on there too
This has been out of stock on Ring's website the last couple days when I've checked. Was it actually available for purchase?
Nov 18, 2025 05:14 PM
284 Posts
Joined Jan 2016
D_BaggggNov 18, 2025 05:14 PM
284 Posts
Can confirm these work with Home Assistant. I got 12 from a recent deal and they've been rock solid - open/close updates are basically instant

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Nov 18, 2025 06:26 PM
136 Posts
Joined Aug 2011
coupon_monsterNov 18, 2025 06:26 PM
136 Posts
Quote from Versatilias :
It works without a subscription. I have these connected to home assistant.

You do need to buy a z-wave usb stick to connect the sensor to home assistant.
If you have already have a ring alarm hub you can use these with home assistant without a subscription or a z-wave stick. Use ring-mqtt to setup the integration and you will get the sensors integrated into home assistant that way.
Today 05:48 PM
1,782 Posts
Joined Nov 2005
g10nyToday 05:48 PM
1,782 Posts
Except, of course, that Home Assistant can only be accessed remotely by using a third-party subscription, which may be more cost-effective than what Ring subscriptions ring up at. If you are at home all the time, no problem.
2
Today 06:05 PM
2,454 Posts
Joined Oct 2008
TheRemix18Today 06:05 PM
2,454 Posts
Quote from liljay2k :
6 pack is $30 on Ring's website

edit: Try code: PROTECTPLAN on there too
It's OOO
Today 06:25 PM
953 Posts
Joined Sep 2007
liljay2kToday 06:25 PM
953 Posts
Quote from Mawk1 :
This has been out of stock on Ring's website the last couple days when I've checked. Was it actually available for purchase?
Yes but I ordered last week
Today 11:41 PM
13 Posts
Joined Jun 2016
gamersat678Today 11:41 PM
13 Posts
Quote from g10ny :
Except, of course, that Home Assistant can only be accessed remotely by using a third-party subscription, which may be more cost-effective than what Ring subscriptions ring up at. If you are at home all the time, no problem.
I mean you can pay money to support the devs and access remotely. A cool thing about HA is you don't have to do that... Run tailscale, wireguard, or a reverse proxy (NGinx for example). All add-ons you can download with HA! Just some button pushing and you have it for free, and can access it remotely.

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