Height of Motion Sensor

How high can I place the motion sensor? From what I've read, it seems the most efficient height is around 5 feet off the ground? Can I place it any higher? Would it not be as effective if I placed it higher than 5 feet?

I spent some time testing my

I spent some time testing my motion sensor in a few locations and talking with customer support about it, and it seems that placing it about 4.5 to 5 feet off of the ground will give it the maximum range. Placing it higher definitely decreases the sensitivity, though it will still work.

In my case, I tried it about 7 feet off of the ground and the range seemed to drop to about 10 feet. I was told that this is because the part of the motion sensor that "looks down" is less sensitive so that it will not detect small pets. This works fine in my case, because I have it in a small room, but you may want to test it out in your case first to make sure that a sensor at that height would cover what you need to protect.

Hope that helps!


It would be good to see some

It would be good to see some test results on this, maybe in the form of a graph (height of device placement x range of detection) so one would know what to expect. Would also like to know the "angle" of motion detection, assuming it is significantly less than 180 degrees. Additionally, I wonder how positioning a sensor so it is something other than flat against a wall (e.g., aimed downwards at an angle) might affect detection of motion. (I only just purchased Simplisafe, and have not installed it yet, but with six cats running around have concerns about accidental alarms).

I'm afraid we don't have any

I'm afraid we don't have any graphs readily available, but I can describe the Motion Sensor's detection pattern in a little more detail.

Horizontal:The sensor can detect motion 45 degrees left and right of center, for a total of 90 degrees horizontally. This means that if you put the sensor in the corner of a room, it can generally cover the whole room, left-to-right.

Vertical:The sensor looks straight ahead and down towards the ground. As @mgal12 said, it is most sensitive looking straight ahead (the exact range depends on a lot of factors, but is generally about 20-30 feet). It is progressively less sensitive the further you are below the sensor.

In terms of avoiding false alarms with cats, usually the most important thing to do is to make sure to place the sensor in a location where the cats cannot get too close to it. For example, it's a good idea to adhere the sensor to a wall, where there are no bookshelves, stairs, banisters, or other furniture that the cats could climb on and get within a few feet of the sensor. If the sensor is 4-5 feet off of the ground, it shouldn't detect a cat on the ground; however, it could detect a cat straight in front of it, within about 5 feet of the sensor.

I hope that helps. Please let us know if you need more information.


SimpliSafe, Inc. Live. Safely.

That definitely helps, thank

That definitely helps, thank you. I'm about ready to fire up the system, and expect some trial and error, but the more I can cut out the "error" the sooner it'll be up and running.

By the way, I saw a comment somewhere stating that the keypad looks "cheap," or something like that. Nothing could be further from the truth. The entire system oozes quality, and I think it will meet my needs beautifully.

Now, if I can keep those cats at bay . . . .

Thanks for this reply! It

Thanks for this reply! It was a tremendous help. We are trying to mount our sensor in a way that will not detect our large dog. Decided to go with 5 ft high and upside down....we'll see how that works.

I am new to the system. I was

I am new to the system. I was struggling with motion detector; it has been a hit or miss. I have two storeyed cathedrawl ceiling in my family room and it is quite large, 20' corner to corner. Since I had all the way up to 20' ceiling, I had placed sensor high at 10-12 ft thinking it will cover larger area. After reading thru the forum and the technicalities of how the sensor reads data (45 degrees down), I think I am feeling that lower is better. The SS reply on this thread that sensitivity progressively reduces with height below the sensor is crucial. You better be in straight line with the sensor than below it. I can go down even to 4 ft since I don't have pets. Coupled with this I also discovered that hidden sensitivity switch. I dont know why SS does not talk about that in the manuals. I will try these out tomorrow and see if it works.

@Manju.Ananth, first, welcome

@Manju.Ananth, first, welcome to the forums! They are a great interactive community to exchange ideas and comments, and to find answers to your questions. The search tool on the top right of the page (a bit hidden) is very good to use too.

Which now brings me to the a topic asked, raised many times and we have a brand new (and very good forum moderator who seems to be everywhere rapidly answering questions) Michelle.

Michelle, I checked the online manual in the customer support center and unless I missed it Manju.Ananth is spot on. There is no mention of the sensitivity switch in the manual. I too remember reading about it in a post hondaman88 did years ago.

Now is the time for SS to make a conscious decision to act, not just reply suggestions are being passed to the development team. We are not asking for world peace here (would be nice but going to happen) but small, easy, quick and inexpensive things to improve customer satisfaction. (I do believe someone who works at SS with the initials C.L. actually says that it is an interest of his when he has speaking engagements throughout the Boston area :-).

Here is one:

@Manju.Ananth, thanks for posting! I have spoken with our Marcom dept and the manual will be updated within X days and will be online. Thank you for bringing this to our attention.


@John Doe, we have heard your request to improve and expand the search tool. There is now a separate, expanded advanced search tool to assist all of you to find answers to your questions (and help us control support costs!!) Win win. (Okay, you don't have to add that last part but it is true.)

There are many others. Michelle, ball is pitched, it's straight down the middle, nice and slow, now your turn to hit it out of the park! Two easy requests that are years in the making; you can make SS history, make that home run, by responding is a concrete, positive answer.......

The sound of crickets or the roar of the crowd at Fenway?

@Manju.Ananth Welcome


Welcome indeed! I’m sorry about your difficulty with the motion sensors. I would absolutely play around with the sensitivity switch to see what works best for your space. We generally recommend that the motion sensor be placed at 5-6 feet so that it can catch any people that walk by. If you would like someone to help you find the ideal locations for your motion sensors, please feel free to give us a call!


I can’t disagree, world peace would be great. I do appreciate your feedback, and will look into your questions concerning the manual. If there are any updates, I will absolutely let you know!

SimpliSafe Home Security

@Michelle, thanks, and do

@Michelle, thanks, and do appreciate you looking into the manual. If it is updated, will save many posts and phone calls into support.

I am placing a motion

I am placing a motion detector in my home office which has a router in the room. How far from a router should the motion be placed to ensure no interference?

Routers operate on a

Routers operate on a different frequency so it won't bother it what so ever. I have 3 routers in my house and zero issues.

Much appreciated

Much appreciated

However, heat sources (pets,

However, heat sources (pets, AC/heat ducts, fire places/heaters, electrical things which get hot, windows which get sun on them) can drive the motion (actually change in heat) sensors wacky.

Hi there! We have had our

Hi there! We have had our unit about a year now...just went away for a week. Motion detector went off TWICE!
We do have two cats...but they have never set it off before....our motion detector is mounted at the ceiling level of the kitchen/dining room. There is a chair near there the cat could have roosted on approximately 2 feet from the wall and 5 or 6 feet under the detector....But again, the cat has never set it off before....
There is also a kitchen work island approximately 12 feet from the detector. If the cat was on the island, could that have set it off?
We really have to get a handle on this, because I am told we will have to pay for the Sherriff to come out and inspect if it happens again....
Any help would be appreciated. BTW the cats are about 12 to 15 pounds each....
Thanks for any help!

Just read your comment about

Just read your comment about the motion sensors and heat from sunny windows.....Did not know that!
Having trouble with sensor going off while away. Have two cats....blamed it on the cats! Now I am wondering.....
Think maybe I will just remove the detector from that room....it has six windows!!
Thanks for the comment!

The ceiling seems like the

The ceiling seems like the best spot in one room for a motion sensor. Any reason not to? The corners have other things in the way and/or would miss large parts of the room. Thanks!

The higher it is located, the

The higher it is located, the larger the "dead zone" underneath it.