Mighty Mule Driveway Alarm (FM231) | Mighty Mule Automatic Gate Openers
Mighty Mule Driveway Alarm (FM231) | Mighty Mule Automatic Gate Openers
Mighty Mule Driveway Alarm (FM231) | Mighty Mule Automatic Gate Openers
Mighty Mule Driveway Alarm (FM231) | Mighty Mule Automatic Gate Openers
Mighty Mule Driveway Alarm (FM231) | Mighty Mule Automatic Gate Openers
Mighty Mule Driveway Alarm (FM231) | Mighty Mule Automatic Gate Openers
Mighty Mule Driveway Alarm (FM231) | Mighty Mule Automatic Gate Openers
Mighty Mule Driveway Alarm (FM231) | Mighty Mule Automatic Gate Openers
Mighty Mule Driveway Alarm (FM231) | Mighty Mule Automatic Gate Openers
Mighty Mule Driveway Alarm (FM231) | Mighty Mule Automatic Gate Openers
Mighty Mule Driveway Alarm (FM231) | Mighty Mule Automatic Gate Openers
Mighty Mule Driveway Alarm (FM231) | Mighty Mule Automatic Gate Openers
Mighty Mule Driveway Alarm (FM231) | Mighty Mule Automatic Gate Openers
Mighty Mule Driveway Alarm (FM231) | Mighty Mule Automatic Gate Openers
Mighty Mule Driveway Alarm (FM231) | Mighty Mule Automatic Gate Openers
Mighty Mule Driveway Alarm (FM231) | Mighty Mule Automatic Gate Openers
Mighty Mule Driveway Alarm (FM231) | Mighty Mule Automatic Gate Openers
Mighty Mule Driveway Alarm (FM231) | Mighty Mule Automatic Gate Openers

Mighty Mule Driveway Alarm (FM231)

Mighty Mule Driveway Alarm (FM231)

$89.95

The Mighty Mule FM231 wireless driveway alarm delivers reliable, long-range vehicle detection so you can secure your property without a gate or complex setup. You’ll appreciate its DIY-friendly installation, clear indoor chime alerts, and the ability to expand coverage with extra receivers.

  • Reliable electromagnetic vehicle detection senses mass-metal motion passing through your driveway
  • Included indoor receiver emits a clear audible chime when a vehicle enters or exits
  • Expandable system lets you add multiple FM231‑R receivers to cover larger properties and different locations
  • Easy DIY installation with included mounting stake—bury the sensor beside your driveway and place the receiver where you need it
  • Wireless connectivity reaches up to 400 ft between the outdoor transmitter and indoor receiver
  • Battery-powered design runs on two AA batteries (not included) and features low‑battery indicators on both units
  • Operates stand‑alone—no gate or gate opener required—and comes with a 12‑month warranty and dedicated technical support

Standalone driveway alarm — works for any driveway. No gate or gate opener required.

What's in the Box
Transmitter
Sensor
Receiver
Transformer
Mounting post (3 pcs)
Warranty

12 Month Warranty when purchased directly from Mighty Mule or an authorized dealer.

Resources
FM231 Installation Manual PDF

Home Security, Made Easy

Easy Installation

Simple DIY installation. Works independently and does not need a Mighty Mule Gate Opener.

Reliable Detection System

Utilizes electromagnetic vehicle detection system and only senses mass metals. Avoids false alarms.

Battery-Powered

Only needs 2 AA batteries for long lasting operation. Low battery indicators on both the receiver and transmitter.

Wide Wireless Range

Up to a 400 ft. wireless range from outdoor transmitter to the indoor receiver. Get instant alerts of any vehicles entering the property.

Frequently Asked Questions

What is a wireless driveway alarm?

The FM231 wireless driveway alarm uses an electromagnetic vehicle detection system to sense metal mass in motion and alerts you with an indoor chime.

Can the FM231 alarm be expanded with additional receivers?

Yes, the FM231 is an expandable driveway alarm system that allows you to add additional indoor receivers (FM231‑R) to cover multiple areas.

What is the wireless range of the outdoor driveway sensor?

The FM231 outdoor driveway sensor provides a wireless range of up to 400 feet between the transmitter and each indoor receiver.

Does the FM231 require batteries?

The FM231’s indoor receiver plugs into a standard outlet, while its transmitter is powered by two AA batteries. When the transmitter’s batteries run low, you’ll see alerts on the receiver.

Is a gate required to use the property security alarm?

No, the FM231 property security alarm is a standalone product that does not require a gate or gate opener to operate.

What prevents false alarms in this electromagnetic sensor?

The FM231’s electromagnetic sensor only senses mass metals, avoiding false alarms from animals or debris while providing a clear driveway chime alarm.

What comes in the box when purchasing the FM231 driveway alarm?

The FM231 kit includes a transmitter, sensor, an indoor receiver for driveway alarm, transformer, and three mounting posts.

Customer Reviews

Mighty Mule Driveway Alarm (FM231)

$89.95