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phoinix | Staff 20.7K Views
Jan 10, 2026 11:25 PM

Kasa Smart Motion Sensor & Dimmer Switch

$18

$35

48% off
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Deal Details
Amazon has Kasa Smart Motion Sensor & Dimmer Switch (ES20M) for $18.23. Shipping is free with Prime or on $35+ orders.

Thanks to Deal Hunter phoinix for finding this deal.

About this item:
  • Motion-Activated Lighting: Automatically turns lights on with motion and off after a preset time
  • Daylight Sensor: Prevents lights from turning on during daytime
  • Smart Dimming: Adjustable brightness from 1% - 100% with custom schedules
  • Voice & App Control: Works with Alexa, Google Assistant, SmartThings, and the Kasa app
  • Away Mode: Random on/off scheduling for home security
  • Safe & Reliable: UL certified; supports up to 300W incandescent or 150W dimmable LED
  • Smart Ecosystem: Integrates with other Kasa devices for automation
  • Easy Setup: App-guided installation; requires neutral wire and 2.4 GHz Wi-Fi

Editor's Notes

Written by qwikwit | Staff

Original Post

Written by phoinix | Staff
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Amazon has Kasa Smart Motion Sensor & Dimmer Switch (ES20M) for $18.23. Shipping is free with Prime or on $35+ orders.

Thanks to Deal Hunter phoinix for finding this deal.

About this item:
  • Motion-Activated Lighting: Automatically turns lights on with motion and off after a preset time
  • Daylight Sensor: Prevents lights from turning on during daytime
  • Smart Dimming: Adjustable brightness from 1% - 100% with custom schedules
  • Voice & App Control: Works with Alexa, Google Assistant, SmartThings, and the Kasa app
  • Away Mode: Random on/off scheduling for home security
  • Safe & Reliable: UL certified; supports up to 300W incandescent or 150W dimmable LED
  • Smart Ecosystem: Integrates with other Kasa devices for automation
  • Easy Setup: App-guided installation; requires neutral wire and 2.4 GHz Wi-Fi

Editor's Notes

Written by qwikwit | Staff

Original Post

Written by phoinix | Staff

Community Voting

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Top Comments

MagentaDesk1020
343Comments
18Reputation
it's nice to have it turn to minimum brightness when getting up to pee in the middle of the night
Go to Comment
T013y
123Comments
93Reputation
The 3-ways had their issues and first batch was the worst. Those are working good enough for me. The single pole, switches are fine.

I had tons of problems with this model the most, ES20M. You check Reddit and you will find others with issues.

All the 100 switches were happier when they are on their own vlan. The vendor even told me to do that. I created a vlan just for one of the ES20M and it still locked up. Make sure your WiFi is only 2.4 for them.
Go to Comment
MagentaDesk1020
343Comments
18Reputation
uh what, this is for the convenience...no one is trying to save cost with this (even though it does). i don't have to touch the light switch when i open the closet door for instance
Go to Comment

Community Reviews

The Kasa ES20M motion sensor switch is best for hands free lighting and automation, especially in bathrooms, closets, hallways, laundry rooms, garages, and kitchens. It can trigger lights or fans on motion, then dim or shut them off on a timer, with useful schedules like lower brightness at night and full brightness in the morning. The convenience angle comes through clearly, and the price is often compared favorably with other motion or dimmer switches. The main concern is reliability, with repeated reports of lockups, fail closed behavior, and firmware problems that sometimes require a breaker reset or replacement.

Common Questions (5)

AI-generated summary based on comments from the community. Updated ago

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62 Comments

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Jan 10, 2026 11:42 PM
843 Comments
Joined May 2006
sloepokeJan 10, 2026 11:42 PM
843 Comments

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

Earn 25% back on this item when you pay with your Prime Visa. Also good on the two-pack.
1
Jan 11, 2026 1:14 AM
61 Comments
Joined Nov 2010
yoshis007Jan 11, 2026 1:14 AM
61 Comments
Quote from sloepoke View quoted comment :
Earn 25% back on this item when you pay with your Prime Visa. Also good on the two-pack.
Not seeing the 25% cashback on prime visa. Midwest here.
Pro
Jan 11, 2026 2:05 AM
2.4K Comments
Joined May 2010
artcab
Pro
Jan 11, 2026 2:05 AM
2.4K Comments
Quote from yoshis007 View quoted comment :
Not seeing the 25% cashback on prime visa. Midwest here.
https://www.amazon.com/l/17985366...B09NMX9N24
Jan 11, 2026 2:14 AM
313 Comments
Joined Aug 2016
photodoctorJan 11, 2026 2:14 AM
313 Comments
Why does a motion sensor switch need to be a smart switch?
6
Jan 11, 2026 2:24 AM
1.4K Comments
Joined Nov 2017
spittlbmJan 11, 2026 2:24 AM
1.4K Comments
Quote from photodoctor View quoted comment :
Why does a motion sensor switch need to be a smart switch?
Bathroom fan
1
Jan 11, 2026 3:00 AM
39.5K Comments
Joined Nov 2005

This comment has been rated as unhelpful by Slickdeals users.

Jan 11, 2026 3:07 AM
343 Comments
Joined Dec 2025
MagentaDesk1020Jan 11, 2026 3:07 AM
343 Comments
Quote from Dr. J View quoted comment :
Really think about your application and if it will ever pay back. Let's call this $20 for the sake of easy numbers. For me, and I pay $0.28/kwh which is very high, that's 71kwh payback. If this controls a 10watt LED then the switch, assuming it lasts that long, needs to save 7142 hours of runtime to pay for itself which is about 300 days. So yeah don't approach this as if it's going to save money.
uh what, this is for the convenience...no one is trying to save cost with this (even though it does). i don't have to touch the light switch when i open the closet door for instance

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Jan 11, 2026 3:15 AM
123 Comments
Joined Sep 2019
T013yJan 11, 2026 3:15 AM
123 Comments

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

I purchased 8 of these switches 2 years ago. I thought they would work great and all-in-one, I was wrong.

They have huge FW problems and they know it. For some reason they don't want to fix it unless you create a ticket. Even than it has problems. The stock FW has a memory leak and it locks up. The switch will fail in either positions and the manual switch will stop working. This is a huge fire hazard and breaks local code.

Do not buy their switches. Their switches has several issues and not worth any price. So sad, since it started so strong 6 years ago.
6
5
Jan 11, 2026 3:21 AM
4.6K Comments
Joined Jan 2011
carlson03Jan 11, 2026 3:21 AM
4.6K Comments

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Quote from T013y View quoted comment :
I purchased 8 of these switches 2 years ago. I thought they would work great and all-in-one, I was wrong. They have huge FW problems and they know it. For some reason they don't want to fix it unless you create a ticket. Even than it has problems. The stock FW has a memory leak and it locks up. The switch will fail in either positions and the manual switch will stop working. This is a huge fire hazard and breaks local code. Do not buy their switches. Their switches has several issues and not worth any price. So sad, since it started so strong 6 years ago.
I have tons of their regular, 3 way and dimmer switches, plus the plugs, never once have they locked up
2
Jan 11, 2026 3:27 AM
621 Comments
Joined Feb 2016
RacerXXYJan 11, 2026 3:27 AM
621 Comments
Quote from photodoctor View quoted comment :
Why does a motion sensor switch need to be a smart switch?
I was thinking the exact same thing. Then I saw the reply to you about using it for a bathroom fan, and I still don't get it.
1
Jan 11, 2026 3:33 AM
343 Comments
Joined Dec 2025
MagentaDesk1020Jan 11, 2026 3:33 AM
343 Comments

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

Quote from RacerXXY View quoted comment :
I was thinking the exact same thing. Then I saw the reply to you about using it for a bathroom fan, and I still don't get it.
it's nice to have it turn to minimum brightness when getting up to pee in the middle of the night
6
Jan 11, 2026 5:42 AM
4.3K Comments
Joined Feb 2010
SumDuudJan 11, 2026 5:42 AM
4.3K Comments
Quote from photodoctor View quoted comment :
Why does a motion sensor switch need to be a smart switch?
Why does any switch? "Need" is based on personal choice. There could be rules in the app, scenes, whatever. If YOU can't think of a reason then it probably isn't for you.
Jan 11, 2026 6:38 AM
123 Comments
Joined Sep 2019
T013yJan 11, 2026 6:38 AM
123 Comments

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

Quote from carlson03 View quoted comment :
I have tons of their regular, 3 way and dimmer switches, plus the plugs, never once have they locked up
The 3-ways had their issues and first batch was the worst. Those are working good enough for me. The single pole, switches are fine.

I had tons of problems with this model the most, ES20M. You check Reddit and you will find others with issues.

All the 100 switches were happier when they are on their own vlan. The vendor even told me to do that. I created a vlan just for one of the ES20M and it still locked up. Make sure your WiFi is only 2.4 for them.
6
Pro
Jan 11, 2026 6:43 AM
432 Comments
Joined Oct 2021
LivelyWallaby1957
Pro
Jan 11, 2026 6:43 AM
432 Comments

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

Quote from photodoctor View quoted comment :
Why does a motion sensor switch need to be a smart switch?
The smart part is for the settings like post-sensor timer and light brightness at a certain time of day or night. You can set it to be on when you shower and then say you want the fan to stay on for 2 mins after you walk away, or any amount of time to clear smells from the toilet area or humidity.
1

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Jan 11, 2026 6:46 AM
123 Comments
Joined Sep 2019
T013yJan 11, 2026 6:46 AM
123 Comments

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

Quote from photodoctor View quoted comment :
Why does a motion sensor switch need to be a smart switch?
So many reasons.
You can program for what routines you would like. Check Home Assistant or other controller apps.

I like the lights to turn different brightness depending the brightness of the room and time of day. All based on presence. It is so nice to walk into a space and not need to touch anything. Than the lights just turn off automatically.

Unlimitedly mmWave is better and you will learn you might want that.

Is any of this NEEDED, nope. Is it nice to have things automated and remote, yes.

Holiday decorations is also a nice thing.
1

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