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frontpageRed_Liz | Staff posted May 06, 2025 04:58 PM
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Item 1 of 3
frontpageRed_Liz | Staff posted May 06, 2025 04:58 PM

Ring Alarm Contact Sensor (2nd Generation)

+ Free Shipping

$15

$20

25% off
eBay
13 Comments 22,197 Views
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Deal Details
A4C via eBay has Ring Alarm Contact Sensor (2nd Generation) on sale for $14.99. Shipping is free.

Thanks to Staff Member Red_Liz for sharing this deal.

Key Features:
  • Get instant mobile alerts when doors and windows open in your home
  • Now smaller to enable increased placement options
  • Easy installation with no tools required
  • Mounts to door and window frames
  • Includes 2 x 3V CR2032 batteries
  • Requires the Ring Alarm Base Station

Editor's Notes

Written by citan359 | Staff
  • About this Deal:
    • Our research indicates that this deal is $5.00 less (25% savings) than the next best available price from a reputable merchant with prices starting at $19.99 at the time of this posting.
  • About this Product:
    • 90 Day Warranty
  • About this Store:
    • Seller A4C has a 98.3% positive feedback rating with over 3.1 million items sold.
    • 30 days returns. Seller pays for return shipping.
  • Additional Notes:
    • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.

Original Post

Written by Red_Liz | Staff
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
A4C via eBay has Ring Alarm Contact Sensor (2nd Generation) on sale for $14.99. Shipping is free.

Thanks to Staff Member Red_Liz for sharing this deal.

Key Features:
  • Get instant mobile alerts when doors and windows open in your home
  • Now smaller to enable increased placement options
  • Easy installation with no tools required
  • Mounts to door and window frames
  • Includes 2 x 3V CR2032 batteries
  • Requires the Ring Alarm Base Station

Editor's Notes

Written by citan359 | Staff
  • About this Deal:
    • Our research indicates that this deal is $5.00 less (25% savings) than the next best available price from a reputable merchant with prices starting at $19.99 at the time of this posting.
  • About this Product:
    • 90 Day Warranty
  • About this Store:
    • Seller A4C has a 98.3% positive feedback rating with over 3.1 million items sold.
    • 30 days returns. Seller pays for return shipping.
  • Additional Notes:
    • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.

Original Post

Written by Red_Liz | Staff

Community Voting

Deal Score
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Top Comments

OutFr0mUndr
44 Posts
34 Reputation
These also work in an outdoor environment. I used one on my gate for like 3 years without issue because I didn't want to pay the big bucks for Rings outdoor sensor.
mrtramplefoot
621 Posts
129 Reputation
These are absolutely fantastic for home assistant as they are just normal Z-Wave sensors. I have like 40 of them or something

12 Comments

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May 07, 2025 04:27 PM
621 Posts
Joined Aug 2011
mrtramplefootMay 07, 2025 04:27 PM
621 Posts

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

These are absolutely fantastic for home assistant as they are just normal Z-Wave sensors. I have like 40 of them or something
2
1
May 07, 2025 04:30 PM
44 Posts
Joined Feb 2012
OutFr0mUndrMay 07, 2025 04:30 PM
44 Posts

Our community has rated this post as helpful. If you agree, why not thank OutFr0mUndr

These also work in an outdoor environment. I used one on my gate for like 3 years without issue because I didn't want to pay the big bucks for Rings outdoor sensor.
3
May 07, 2025 04:45 PM
949 Posts
Joined Oct 2007
ks_rajeshMay 07, 2025 04:45 PM
949 Posts
Quote from mrtramplefoot :
These are absolutely fantastic for home assistant as they are just normal Z-Wave sensors. I have like 40 of them or something
can u pls explain how you use it ?
1
May 07, 2025 04:56 PM
621 Posts
Joined Aug 2011
mrtramplefootMay 07, 2025 04:56 PM
621 Posts
Quote from ks_rajesh :
can u pls explain how you use it ?
Just need a z-wave dongle, they connect like any other z-wave device
May 07, 2025 10:49 PM
595 Posts
Joined Nov 2017
Rudedog7May 07, 2025 10:49 PM
595 Posts
Quote from mrtramplefoot :
These are absolutely fantastic for home assistant as they are just normal Z-Wave sensors. I have like 40 of them or something
So you are saying they will work with smartthings with no problem? Looks like a homeseer sensor on the outside.
1
May 07, 2025 10:50 PM
621 Posts
Joined Aug 2011
mrtramplefootMay 07, 2025 10:50 PM
621 Posts
Quote from Rudedog7 :
So you are saying they will work with smartthings with no problem? Looks like a homeseer sensor on the outside.
Should, never used it, but they are literally just ring branded z-wave sensors. They should work with anything that works with z-wave
May 08, 2025 05:20 PM
124 Posts
Joined Apr 2016
tmanzxMay 08, 2025 05:20 PM
124 Posts
I find these 2nd gen better than their 1st gen because of their smaller size and battery type. As convenient as they are for self management, I am still not happy with how soon they run out of battery vs ADT which in my previous use, lasted 10+years without issues. These sensors from Ring get glitchy, too. I often can't arm the alarm because one of the sensors get glitchy. I would say it happens to me about once per month with their glitchiness so I have to do a "bypass". I have a total of 16 of these sensors, mostly 2nd gen version. I also have 3 of those motion sensors and those seem to be working more smoothly.
1

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May 09, 2025 02:35 PM
1,062 Posts
Joined Nov 2015
pcgeekpcgeekMay 09, 2025 02:35 PM
1,062 Posts
Quote from tmanzx :
I find these 2nd gen better than their 1st gen because of their smaller size and battery type. As convenient as they are for self management, I am still not happy with how soon they run out of battery vs ADT which in my previous use, lasted 10+years without issues. These sensors from Ring get glitchy, too. I often can't arm the alarm because one of the sensors get glitchy. I would say it happens to me about once per month with their glitchiness so I have to do a "bypass". I have a total of 16 of these sensors, mostly 2nd gen version. I also have 3 of those motion sensors and those seem to be working more smoothly.
Weird. I never encountered any glitchy Ring Alarm sensors, but I did have one completely fail after 3 years of use. Amazon offered me a free replacement even when I've ran out of warranty.
Pro
May 27, 2025 11:43 AM
2,047 Posts
Joined May 2010
artcab
Pro
May 27, 2025 11:43 AM
2,047 Posts
Quote from mrtramplefoot :
These are absolutely fantastic for home assistant as they are just normal Z-Wave sensors. I have like 40 of them or something
Didn't realize they're Z-Wave! Picked one up for a mail box automation, as the current Aqara Zigbee window/door sensor in my curbside outdoor mailbox loses connectivity too often to be reliable. Hoping this Z-Wave device is more reliable in my HA "You've Got Mail!" voice assistant automation. I have a Nortek USB combo stick (Zigbee and Z-Wave), looking forward to trying it out. Hopefully the Z-Wave connectivity is longer range and more reliable than the Zigbee range of the Aqara device.
Jun 15, 2025 05:50 PM
586 Posts
Joined Sep 2006
fengfangJun 15, 2025 05:50 PM
586 Posts
Do you have to have a subscription to use Ring Alarm sensors?
Jun 24, 2025 04:56 PM
48 Posts
Joined Jul 2018
dennisnguyen00Jun 24, 2025 04:56 PM
48 Posts
Quote from fengfang :
Do you have to have a subscription to use Ring Alarm sensors?
Subscription is only for professional alarm monitoring. Not self-monitoring.
Jun 24, 2025 06:33 PM
80 Posts
Joined Mar 2014
zeesungJun 24, 2025 06:33 PM
80 Posts
Thanks. I bought 4 of them.

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