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frontpage Posted by Red_Liz | Staff • May 6, 2025
frontpage Posted by Red_Liz | Staff • May 6, 2025

Ring Alarm Contact Sensor (2nd Generation)

+ Free Shipping

$15

$20

25% off
eBay
13 Comments 21,563 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
600 Posts
125 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 7, 2025
600 Posts
Joined Aug 2011
May 7, 2025
mrtramplefoot
May 7, 2025
600 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 7, 2025
44 Posts
Joined Feb 2012
May 7, 2025
OutFr0mUndr
May 7, 2025
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 7, 2025
935 Posts
Joined Oct 2007
May 7, 2025
ks_rajesh
May 7, 2025
935 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 7, 2025
600 Posts
Joined Aug 2011
May 7, 2025
mrtramplefoot
May 7, 2025
600 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 7, 2025
582 Posts
Joined Nov 2017
May 7, 2025
Rudedog7
May 7, 2025
582 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 7, 2025
600 Posts
Joined Aug 2011
May 7, 2025
mrtramplefoot
May 7, 2025
600 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 8, 2025
124 Posts
Joined Apr 2016
May 8, 2025
tmanzx
May 8, 2025
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 9, 2025
1,038 Posts
Joined Nov 2015
May 9, 2025
pcgeekpcgeek
May 9, 2025
1,038 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
2,016 Posts
Joined May 2010
May 27, 2025
artcab
Pro
May 27, 2025
2,016 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
583 Posts
Joined Sep 2006
Jun 15, 2025
fengfang
Jun 15, 2025
583 Posts
Do you have to have a subscription to use Ring Alarm sensors?
Jun 24, 2025
48 Posts
Joined Jul 2018
Jun 24, 2025
dennisnguyen00
Jun 24, 2025
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
79 Posts
Joined Mar 2014
Jun 24, 2025
zeesung
Jun 24, 2025
79 Posts
Thanks. I bought 4 of them.

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