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Mighty Mule

Model # FM231WB

Internet # 202072041

Store SKU # 653097

Wireless Driveway Alarm

This item has been discontinued.
The Home Depot no longer carries this specific product.

$59.97 /each




Model # FM231WB

Internet # 202072041

Store SKU # 653097

Store SO SKU # 556771

The Mighty Mule Wireless Driveway Alarm alerts you when a guest enters your driveway. The alarm uses reliable electromagnetic vehicle detection to sense when a vehicle is passing through your driveway. With electromagnetic technology, the Wireless Driveway Alarm avoids false alarms from an animal or person. With an extensive reception range of 400 ft. it adds security and convenience to your property.

  • Electromagnetic technology that detects and alerts of vehicle(s) moving within a 3 - 12 ft. radius of the sensor
  • Easy DIY (do it yourself) installation for your property
  • Alerts you with a chime when your visitors approach
  • The alarm features a sensitivity adjustment to adjust to your comfort
  • Backed by a 12 month Mighty Mule warranty and technical support

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Brand/Model Compatibility 
Mighty Mule Gate Openers 
Commercial/Residential Use 
Fencing Product Type 
Gate Opener Part/Accessory 
Part/accessory type 
Product Weight (lb.) 
3 lb 
Warranty / Certifications
Manufacturer Warranty 
Backed by a 12 month Mighty Mule warranty and technical support 


Rated 3.9 out of 5 by 168 reviewers.
Rated 5.0 out of 5.0 by Works really well -- so far I was a little leery of this product after reading some of the negative reviews, but it has worked well for me in the 4 days I've had it. I mounted the probe approximately 330 ft from the house down a slight hill from my house and the receiver picks up the signal well from the front of my house. When I had the probe closer to the house I could put the receiver anywhere, including the kitchen, but we prefer the probe as far out as possible and the receiver works best near front of house which is fine. I did mount the whole thing in a tree both to help in sending the signal and to keep it out of the ground where hopefully lightening won't destroy it like it has the previous two more expensive units I lost. It's early but so far it always alerts me when a vehicle passes by and I've had no false alerts. I'll be completely satisfied if it will last for at least a couple of years. The alarm is plenty loud enough for us but sound carries well in our home (hardwood throughout) and we have good hearing. September 14, 2015
Rated 5.0 out of 5.0 by A great buy! I purchased this product over 6 months ago and it has worked perfectly. No false alarms which was a problem with my previous driveway alarm which was sensitive to animals and temperature changes. I have a long driveway, so there is relatively little traffic that could create a false alarm. I have the sensor installed about 75 years from the base station. Given the price of this unit, I expected it to be too good to be true. But I was wrong. I'd highly recommend this product for anyone looking for a driveway sensor. December 24, 2012
Rated 5.0 out of 5.0 by Paranoid in the country Takes some work to install, after that it has worked flawlessly for 5yrs. Only replace batteries once a year in the spring. Have the distance maxed out at about 425ft. Wish it had an add on capability. Would love to be able to turn the front porch light on each time it goes off. Plan on getting an addional receiver for the work shop. March 9, 2015
Rated 4.0 out of 5.0 by Good product We have had the alarm in place for about a month. Works consistently once you have it within range. Simple and does what it says. Would buy again. October 6, 2015
Rated 5.0 out of 5.0 by Very good driveway alarm Driveway alarms have gotten better and cheaper over the last 10 years. There are basically 2 kinds; the magnetic sensor (like this one for vehicles) and the motion sensor, for people, animals, vehicles and anything that moves. Motion sensors tend to give more false alarms do to branches or brush moving in the wind. This one has been working very good for me. I found a spot about 150 feet away with a pretty clear view of the receiver to mount the transmitter. I slid the sensor in a 3" PVC culvert that ran under the driveway, it even picks up my bicycle when I ride over that spot. Keep in mind the line of sight from the spot where you mount the transmitter to the receiver in your home and try to avoid obstacles that will block the signal. The 400 foot (listed) range would only be for optimal placement without any signal interference, 250 feet is more realistic. June 17, 2014
Rated 4.0 out of 5.0 by Works great works good,have to get it adjusted right for your location September 29, 2015
Rated 3.0 out of 5.0 by OK Compromise that works. The product works, but not quite as well as it might. The detector does not detect a vehicle 12 feet out as stated. Ours detects it at about 2 feet with the sensitivity set at max. I checked that using the LED test. We have a woodland habitat and even at less than 100 feet would not communicate between the transmitter and receiver. I placed the transmitter about 8 feet up in a tree, instead of on its one foot tall post, and that fixed the problem. This product is cheaper than one of the pressure sensors (which in retrospect I would have purchased instead) and it does not have the problem of moving branches that a passive IR system has. So as I say this is a compromise that works. June 2, 2015
Rated 5.0 out of 5.0 by we can easily hear the chime throughout the house and now know when people drive into the driveway. we really like being able to know when someone is driving into the driveway now. The chime is plenty loud enough to hear everywhere throughout the house. A good product- thinking of giving it for a Christmas gift as well. September 22, 2015
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