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HENDUN

Motion Sensor Door Bells Chimes for Business, Bed and Fall Sensing,Door Buzzer, Commercial Wireless Security Storefront Bell, Body Motion Sensor Alarm with Remote

Based on 1,615 reviews
Condition: New
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$29.89
Save $12.99 was $42.88

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Availability: In Stock.
Fulfilled by Amazon
Arrives Friday, Oct 30
Order within 13 hours and 33 minutes

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At a glance

Condition
New
Color
1 Receiver & 1 Transmitters & 1 Remote
Model
SF20R
Dimensions
3.94 x 1.97 x 2.76 in
Weight
7.8 oz
Power Source
Battery Powered
Number of Batteries
1 12V batteries required. (included)
In the box
Batteries
Works with
Motion Detector

Features 5

  • EASY, FAST, WIRE FREE INSTALLATION sensor detects motion when entering and sends a signal to the receiver. With wireless remote control, it is more convenient to operate.
  • SELECTABLE RINGTONES the receiver is a doorbell design with 36 different ringtones from melody sounds to simple basic buzzfor personal preferences and 5 welcome songs for retail business use.
  • WIDE RANGE The transmission range of the door chime/alarm is up to 918ft (between detector and receiver) and detection range of the infrared sensor approximately 13-26ft to keep you informed and safe.
  • MULTIPURPOSE motion activated sensor chime, door alarm,mailbox alert,retail business welcome doorbell,visitor chime for shopkeepers and caregiver pager for elderly/dementia.Indoor use only or protected from rain.

Specs 20

Color 1 Receiver & 1 Transmitters & 1 Remote
Brand HENDUN
Power Source Battery Powered
Number of Batteries 1 12V batteries required. (included)
Voltage 12 Volts
Control Method Remote
Noise Level 25 dB
Mounting Type Door Mount

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Oct 30

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

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Top Amazon Reviews

Good battery life
Color: 1 Receiver & 2 Transmitters
Battery life is really good, still haven’t had to replace them after months of use. I just leave it on. I like that I can turn off the sound so it is only has the led indicator. Fast response time and its detection is pretty good.
Reviewed in the United States on May 14, 2025 by Cole
Great Little Item Really Works!!!!
Color: 1 Receiver & 1 Transmitters
This little thing is worth it's weight to me. My husband is a quiet guy and has come in from outside more than once while I was at my desk and accidentally scared the crap out of me because I thought I was alone in the house. It really works and the best part is you can set it for a fairly loud alarm, but I didn't want to scare both of us! Lol I found out you can set it to just have lights flash and it's perfect! They get my attention and saved my sanity! ... show more
Reviewed in the United States on April 17, 2025 by Mary Wannagat
Perfect
Color: 1 Receiver & 1 Transmitters & 1 ...
Works like a charm… sometimes you need to know when the boss is walking through the door.
Reviewed in the United States on May 23, 2025 by Mitchell
It's good
Color: 1 Receiver & 2 Transmitters
It's pretty good
Reviewed in the United States on May 28, 2025 by Yeng Vue
Works Perfectly, Great Value
Color: 1 Receiver & 1 Transmitters
I bought this unit for use as a motion activated doorbell for my store as the one we had was way too quiet to be effective. The unit was easy to install and works perfectly; it's a great value at under $30. The chime unit can be free standing or mounted. The motion sensor can be mounted with mounting tape or screws (included) upside down sideways and has an adjustable bracket. I recommend using screws instead of the mounting tape included as the mounting tape is the standard two sided white foam type that will eventually dry up after a few years and sensor may fall. If you don't want to use screws, I would recommend you buy some 3M auto molding tape which seems to last forever and is very hard to remove. The sensor and transmitter range is fantastic and I had no trouble in my store with it (supposedly it has the range of up to just over the length of 3 football fields). I initially just put batteries in the chime and motion sensor after unboxing and installed them. The default setting is a motion activated door chime that is a loud ding dong ding dong. I did not realize that the unit had a host of other tones, features, voice you can program using the 4 buttons on the unit. I found the programming to be a bit tricky and for my use, the other features are overkill since I just needed it as a motion activated door chime. After messing with it, I found out that it has 4 volume settings. The default setting is set at the LOUDEST setting which is great for some uses. For my roughly 10,000 SQ FT store, the second volume setting is adequate if you do not have any background music playing. ... show more
Reviewed in the United States on May 22, 2023 by imccubbin
Work as expected - happy customer
Color: 1 Receiver & 1 Transmitters
This is the second set I purchased, and it works as expected. I intended this set for my front porch because the delivery people stopped ringing the doorbell. With this, I can be notified when motion is detected on the porch. The sensor is somewhat sensitive, as it can pick up solid winds or leaves flying around. Overall, I am happy with the product. The old set was for my deck, so I know when my dog is ready to go inside. ... show more
Reviewed in the United States on December 2, 2024 by A. Le
I Use This Outside to Alert Me to Persons on My Property
Color: 1 Receiver & 1 Transmitters & 1 ...
I have one at the entrance to my carport and another on the other side of the house at the gate at the front corner of the house. Assigning a different ringtone to each, l can instantly tell which side of the house someone is on. The adjustable volume allows me to make the ringtone audible to myself as well as individuals on approach so that they are aware that their presence is known. I have them set high enough so as not to be triggered by cats or racoons. ... show more
Reviewed in the United States on November 10, 2024 by bernynhel
No mute button
Color: 1 Receiver & 1 Transmitters & 1 ...
Wireless remote doesn’t have a mute button
Reviewed in the United States on April 6, 2025 by Dillon
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