---
product_id: 185542830
title: "Mighty Mule Wireless Driveway Alarm (FM231) (2-(Pack))"
brand: "mighty mule"
price: "FREE"
currency: JPY
in_stock: false
reviews_count: 18
category: "Home Improvement"
url: https://www.desertcart.jp/products/185542830-mighty-mule-wireless-driveway-alarm-fm231-2-pack
store_origin: JP
region: Japan
---

# Mighty Mule Wireless Driveway Alarm (FM231) (2-(Pack))

**Brand:** mighty mule
**Price:** FREE
**Availability:** ❌ Out of Stock

## Quick Answers

- **What is this?** Mighty Mule Wireless Driveway Alarm (FM231) (2-(Pack)) by mighty mule
- **How much does it cost?** FREE with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/185542830-mighty-mule-wireless-driveway-alarm-fm231-2-pack)

## Best For

- mighty mule enthusiasts

## Why This Product

- Trusted mighty mule brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

Size:2-(Pack)
            
          
          
        
      
    
  


        
        
     
	       
     

     

     

     
                              
     
       
      
        
          
        	
            
        			Wireless driveway alarm, electromagnetic technology detects vehicles entering & exiting driveway & alerts you with indoor chime, up to 400&apos; range from indoor receiver to driveway sensor, does not detect people or animals, transmitter requires 2 &quot;aa&quot; batteries, not included, note: use lithium alkaline aa batteries in colder climates, sensitivity adjustment 3&apos; to 12&apos; radius, dip switches for personalized transmission Codes, 1 year warranty.

## Features

- Instantly alerts you when someone pulls into or out of your driveway
- The outdoor electromagnetic sensor only detects vehicles; no false alarms due to animals, children, etc.
- Easy-to-install Electromagnetic Sensor Wand is buried next to your driveway, and detects mass metal moving within a 3-12 ft. radius of the wand.
- When a vehicle passes by the sensor, an outdoor transmitter communicates wirelessly to an internal base station up to 400 ft. away and sounds a pleasant chime
- ›See more product details

## Images

![Mighty Mule Wireless Driveway Alarm (FM231) (2-(Pack)) - Image 1](https://m.media-amazon.com/images/I/11I2+i8Yh5L._SL500_.jpg)

## Customer Reviews

### ⭐⭐⭐⭐ 







  
  
    Currently the best on the market, but needs some upgrades
  

*by G***N on Reviewed in the United States on December 24, 2016*

For 10 years I struggled with two different models of STI driveway monitors (Mighty Mule's main competitor).  The first STI monitor had ongoing issues with moisture intrusion due to its design until it was barely functional.  The replacement, for some unknown reason, went through batteries at a prodigious rate and suffered from fits of repeated false alarms only during dramatic temperature swings.  I had to reset the sensitivity setting constantly to combat the latter.  When STI’s technical support wouldn't respond to my phone and email requests for assistance with my 'less than one year old' replacement, I decided to call it a day with STI and try a Mighty Mule.At the sale price of $59.00 on Amazon, the Mighty Mule FM231 was a good buy and less than either of the two previous STI's.  The Mule looks good right out of the box and the quality of materials is above average (considering the quality of most products today).  I read through many of the reviews others have left and paid particular attention to individual observations for placement and installation techniques (all of which, by the way, are mentioned in the Mule's instructions.  So, pay attention to them.Following are some comments that I have about my installation and (if Mighty Mule is listening) suggestions for improvements.My first observation was that the 'Electromagnetic Sensor Wand' should be more convincingly sealed on both ends, particularly where the cable is attached.  Because this wand must be buried directly in the soil, it should have as much protection from water intrusion as possible.  So, prior to the installation, I sealed both ends with 100% pure silicon sealant and let it cure completely before proceeding.Next, I used 1" schedule 40 PVC irrigation pipe to house the cable (not the Sensor) that runs between the Sensor and the Transmitter in order to protect it from burrowing rodents, roots, shovels etc.  Where the cable exited the PVC leading to the Sensor, I butted the Sensor up to the PVC opening and filled the remaining air gap with silicon to prevent water intrusion into the PVC.  Where the cable exited the PVC at the Transmitter end, I used various PVC fittings to adapt to the mounting post of the Mule.  (The Mule's mounting post is of a non-standard size, so you'll need to fuss with this a bit.)  Note: Even though a smaller 1" or 3/4" PVC pipe will work, the USB style connector on the end of the Sensor cable is too inflexible to make the turn in a 1" or 3/4" 90 degree PVC fitting.The Mulel's instructions tell you to leave some slack in the transmitter end of the cable by pushing it down into the mounting post in order to better facilitate disconnecting/connecting the cable from the transmitter.  However, when following this advice, it was my observation that attempting to push the cable down inside the mounting post isn't possible as the interior diameter of the post is too narrow to permit the cable to coil internally.  To resolve this, and to provide the necessary slack in the cable, I installed a PVC (silicon sealed) junction box between the end of my PVC run and the Mules mounting post where a loop of the transmitter cable could be stored.  This way, cable slack can be easily pulled up and pushed back into the box if the transmitter head needs to be removed for service.My installation had the Sensor placed at 175' from my house, line-of-sight, with no obstructions.  I used the entire length of cable which placed the transmitter at about 165'.  I used Lithium batteries in the transmitter and the alarm worked perfectly upon installation on the factory default sensitivity settings.My 4 star rating for this product is based on the fact that the sensor should be more effectively sealed, the length of the transmitter cable provided is restrictive and the receiver alarm could be more manageable as it isn't loud enough.I'd suggest that Mighty Mule:- Apply a high quality, industrial grade sealant to both ends of the electromagnet- Offer an optional 10' and 20' transmitter cable extension- Redesign the receiver so the user may select from at least three different tone settings of varied duration and increased volume.Overall, I find this product well made and, so far, highly reliable.Update:  May 10, 2017 - To date, it has performed exceptionally well with zero false alarms and zero failures to sound off at the appropriate time.  This winter we had torrential rains and the ground was saturated for months.  The design of the above ground transmitter held up well with no signs of moisture intrusion or corrosion and, presumably, the buried electromagnetic bar (that I sealed with silicon) has fared similarly.

### ⭐⭐⭐ 







  
  
    Works, a bit fussy. No replacement parts available if only one part of it is damaged by animals or elements.
  

*by T***N on Reviewed in the United States on May 26, 2018*

I bought a house that is set way back in the woods up a long driveway, and worse, it's difficult to see the driveway from the house. It wasn't long before I got tired of being taken by surprise by delivery people and other visitors showing up at my door because I never saw or heard them coming up the driveway. It was also a little disturbing that people could easily come onto my property unseen. I bought this driveway alarm and it worked great at solving the problem--I needed something that would selectively react only to vehicles and not to the abundant woodland creatures, and this does exactly that. Unfortunately, about 10% of the time it would fail to respond to a vehicle driving by it. My solution was to get a second identical alarm and set both of them up at slightly different points along the driveway, so that at least one would always be triggered even if the other missed the vehicle. This did the trick, but it did mean that I had to buy and install two alarms to get the reliability I needed.The battery life is surprisingly excellent. I live in New England and assumed that lithium batteries would be required to function in the winter when temperatures can go below 0F. But it turns oout that plain old alkaline batteries work fine, and they last so long that I replace them only once a year and have never seen a low battery warning!The biggest disappointment I had was when one of the units failed after only a couple years. I quickly determined that the reason for the failure was damage to the sensor, either by weather or by wild animal activity. When I called tech support and asked if I could buy a replacement sensor, they said no, they don't sell just the sensor and I would have to buy a whole new alarm. Really? You sell an electronic product that is constantly outdoors and partly buried in the ground, and you don't sell replacement parts for it?

### ⭐⭐⭐⭐⭐ 







  
  
    Great value, works like a charm, added 15 ft of USB cable....UPDATED 3 MONTHS & 13 MONTHS LATER
  

*by B***0 on Reviewed in the United States on May 7, 2017*

13 MONTH UPDATE: Replaced the lithium batteries today 13 months after we installed them. The low battery alarm & indicator did not function, but we guessed by it not working all the time that it needed new batteries. So far, so good. Still highly recommend!We are impressed so far, great for the price. I ended up ordering a 15 ft male to female USB cable on Amazon, blessed by the Mule's manufacturer who says don't add more than 25 ft. We angled the sensor about two feet from the intersection of a gravel road where one driveway goes to our rental cottage and the other goes to our house. We dug a 25' trench about 6" deep, ran the USB cable thru 1" gray electrical PVC pipe. I used electrical tape to secure the USB connections. We then buried the sensor in a sealed plastic bag at an angle, then buried the PVC encased cable, then had a curved piece of PVC at the end where we placed the pipe that came with the unit. We staked that pipe and the unit to a small post beneath a tree. Now nothing shows but that short post. Cars have come and gone today, down our driveway and to our cottage and the monitor, which is located near a window on a TV stand in our bedroom, bleeps its alert every time. The only time I got fooled and thought our Airbnb guests had arrived was when my husband was on his mower! Next time he's mowing I will turn down the volume. The distance from the sensor to the monitor is about 150 feet. Distance from sensor to driveway is about 2 ft. Everything is planted 6" deep in the PVC with all connections securely taped. Easy access to replace batteries, and I have ordered some AA Lithiums from Amazon, expected in two days. UPDATE: working great!!! love it, highly recommend! Follow our recommendations!!!! Regular AA batteries last 3 months. The alarm went off LOUDLY in middle of night to alert us to low battery. I unplugged it and it kept beeping! We inserted the lithium batteries and hopefully this won't happen again for a long time. Still works fine after 3 months and lots of rain!

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-27*