Battery Powered Entrance Alert Chimes at Door

SL-4o Entrance Alert Unit with Passive Infrared Sensor, Plays Gentle Sound at Door!

The SL-40 passive infrared door announcer is a self-contained, battery operated, motion detector. It detects the infrared radiations given off from a human body in motion and emits a pleasant sounding chime, alerting you of a visitor.

  • Description
  • Additional information
  • Reviews (7)
  • Product Manual

A Reliable Entrance Alert that Installs in Minutes!

The product is simple in nature.  Simply mount it above the area you want to monitor, like an entrance or a doorway.  When a visitor passes through the monitored zone, the passive-infrared sensor is triggered.  When this happens, a chime sound eminates from the sensor.  With an adjustable volume control, you can adjust the sound to the level necessary.

The product is ideal for mid-sized offices, shops and stores measuring up to 2,500-3,000 square feet.

If you want the chime to sound at a remote location, please see the Rodann Wireless DA-50L-A.

The SL-40 is an all-in-one motion detecting unit. When its infrared sensor detects motion, a gentle alarm is triggered. Because it uses infrared technology, the SL-40 is resistant to false alarms – no need to worry about sunlight or reflections setting it off. It will also work when the door is open or closed, making this a reliable product that meets a variety of demands.

Mount Sensor & Sound Comes from Sensor

SL-40 Mounted Over Door

Mounting Height of Sensor Changes Monitored Zone Size

SL-40 Monitored Zone Chart
  • SL-40 uses a passive-infrared sensor that is triggered with a combination of heat and movement.  This helps eliminate false alarms caused by shadows, leaves, etc.
  • The product emits a chime sound when triggered
  • A volume control allows you to adjust the volume to your specifications
  • Mounting the product is easy, using the supplied mounting bracket
  • Angle the product to monitor your desired area
  • No wiring required
  • Powered by a 9-volt battery. Under normal conditions, battery should last 18-24 months prior to replacement.
  • Product is made in America
  • One year manufacturer’s warranty

Additional information

Weight 0.5 lbs
Dimensions 3.25 x 5.5 x 2.25 in



kit or accessory


wireless features

Volume Control

wireless range

Sound at Entry

sensor type

Passive-Infrared (PIR)

7 reviews for Battery Powered Entrance Alert Chimes at Door

  1. 5 out of 5

    Barb (verified owner)

    Our doorbell works great, it is so comforting to know that now I can tell if someone enters our office. The installation was easy and the versatility of the unit allows us to place the unit at different angles to catch the door/people movements. We waited too long to purchase, hope you don’t do the same. Customer service was great and the delivery was prompt. Great company to work with.

  2. 5 out of 5

    Frank (verified owner)

    Works like a charm, exactly what I expected it to be by the description – love it! I can hear the bell from the back parking lot of our 3200 sq ft building (bell is on front door).

  3. 4 out of 5

    Leslie (verified owner)

    we are in a small Showroom with a door that is always open, but staff is often in the office unable to see the entrance. This is the perfect solution. Only one drawback, the instructions are nut sufficient to change the "ding dong" to a "ding" as they are written.

  4. 5 out of 5

    Avis Costa Mesa (verified owner)

    This is just what I was looking for at my business location in Costa Mesa. I explained what I needed to a few local hardware store employees. I even said, "You know… Bing, Bong". They gave me the RCA dog look.I received a suggestion for a $150 solution and security system. Thank You 1800DoorBell.

  5. 5 out of 5

    Jim (verified owner)

    Using this as a door chime alert when someone enters the office. Tried the wireless doorbells which worked fine until mounted on two aluminum frame doors. This is just a one piece motion sensor that works as designed. Volume is adjustable as well as the tone. Very easy to install.

  6. 4 out of 5

    Johanna (verified owner)

    Product is easy to install and has a couple options for sounds which are short and sweet, perfect for a shop front or office entryway. Only downfall is that it picks up on the movement of the door when it closes so it makes a noise when somebody enters and also when the door shuts automatically behind the person (they are already far past the sensor at this point so it’s definitely picking up the door movement not the person) overall a great product, does the trick!

  7. 5 out of 5

    Gypsy Morrison

    This was exactly what i needed. The door to my office is around the corner from my desk. Since i couldn’t see when people entered, They scared the crap of me all the time. This doorbell was easy to setup and install. No wires, just add a 9 volt and put two screws in. Took less than 5 minutes. Now i know when someone comes in right away. I did turn the volume down on it, just enough so i can hear it but it doesn’t get annoying.

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