Ring Motion Detector (3rd Gen) Review: An Easy Add-On for Ring Homes
The Ring Motion Detector (3rd Gen) is an indoor passive infrared sensor for Ring homes that connects over Amazon Sidewalk with no base station, or over Z-Wave to a Ring Alarm Base Station: a 90-degree field, a rated range of 9.1 m, pet-friendly sensitivity and up to two years on two AA batteries. Owners call it easy to put up, easy to add in the Ring app and reliable, and they like that it takes ordinary AA batteries. The complaints are a shorter detection distance than some expected and, for one owner, triggers too slow to switch a light on through an Alexa routine. It suits Ring and Alexa users adding motion coverage to a room, not Google Home, Apple Home or Matter households.
- Ring Alarm and Ring camera owners
- Alexa users
- Indoor rooms and hallways
- Homes with pets
Pros
- Easy to mount and add in the Ring app
- Reliable motion alerts, according to owners
- Up to two years on two standard AA batteries
- 90-degree field of view
- Pet-friendly sensitivity settings
- Works with Alexa and with Home Assistant through ring-mqtt
Cons
- Some owners find the detection distance short
- Too slow for light automations, according to one owner
- Needs Amazon Sidewalk coverage or a Ring Alarm Base Station
- Indoor only
- No Google Home, Apple Home, SmartThings or Matter
Who is the Ring Motion Detector (3rd Gen) for?
It is an add-on for people who already use Ring and want motion coverage in another room, a hallway, an entry or a sunroom. Owners buy it as extra security next to their contact sensors, and one long-time Ring Alarm owner says the line has been dependable for years. It connects over Amazon Sidewalk with no base station where Sidewalk coverage reaches, or over Z-Wave to a Ring Alarm Base Station, and it is an indoor sensor with no weather resistance.
What owners like about the Ring Motion Detector (3rd Gen)
Installation is the most common praise: owners describe it as easy to put up and quick to add to the Ring app, especially for anyone who already has other Ring devices. They report that it works reliably, that it lets them know when someone moves through a watched area, and that battery life is long. Owners also like that it runs on standard AA batteries instead of a pack they have to buy new. The spec sheet backs that up with two AA batteries rated for up to two years, motion and low-battery alerts in the Ring app, and adjustable sensitivity with pet-friendly settings for pets under 50 lbs, which one owner learned the other way when his dog walking to the door set it off.
What to know before you buy
Range is the main complaint: two owners say its sensing distance is shorter than they hoped, so place it to cover the approach rather than a far corner of a large room. One owner who wanted it to trigger a smart light switch through an Alexa routine found it too slow on entry and went back to using a camera for that job. Without a Ring Alarm Base Station it relies on Amazon Sidewalk coverage, it works with Alexa and with Home Assistant through the community ring-mqtt integration, and it has no Google Home, Apple Home, SmartThings or Matter support. It senses motion only, with no light or temperature reading.
Is the Ring Motion Detector (3rd Gen) worth it?
For a Ring home, yes: it is simple to add, owners rate it highly and the AA batteries keep upkeep cheap. Buyers who want instant triggers for lighting automations, long detection distances or support outside Ring and Alexa should look at other sensors.
Frequently asked questions
Does the Ring Motion Detector (3rd Gen) need a hub?
No. It connects over Amazon Sidewalk with no base station where Sidewalk coverage reaches, and over Z-Wave when paired with a Ring Alarm Base Station. It is set up in the Ring app.
What batteries does it use and how long do they last?
Two AA batteries, rated for up to two years, and the Ring app sends a low battery warning when they need replacing.
Will my pet set it off?
It has adjustable sensitivity with pet-friendly settings that reduce false alerts from pets under 50 lbs. A pet walking right past it can still trigger it.
How far does it detect motion?
It has a 90-degree field of view and a rated range of 9.1 m (about 30 ft), though some owners find the practical distance shorter.
Does it work with Google Home or Apple Home?
No. It works with Alexa and, through the community ring-mqtt integration, with Home Assistant. Google Home, Apple Home, SmartThings and Matter are not supported.
Can I use it outdoors?
No, it has no weather resistance and is meant for indoor rooms.






