Mighty Mule Driveway Vehicle Sensor FM140 — 100 ft Direct-Burial Wired Probe for Hands-Free Exit

The Mighty Mule FM140 100 ft Driveway Vehicle Sensor is a direct-burial magnetic probe that detects metal vehicles up to a 12-foot field and triggers your automatic gate to open for exit without using a remote.

This hardwired driveway sensor is designed to give vehicles a hands-free exit by sensing mass metal in motion as it passes through its detection zone. Tough enough to be trenched beside a driveway, the FM140 connects directly to your Mighty Mule control box and works with single or dual gate systems. It’s available with 100 feet of cable so you can position the probe where it best detects outbound traffic while staying safely inside your property line.

How does the FM140 detect vehicles and trigger the gate?

The FM140 uses a magnetic field created around the buried probe to sense moving metal. When a vehicle passes through the roughly 12-foot detection zone, the sensor signals the gate opener control box to initiate an open cycle for exit without a remote. Sensitivity is tuned for common vehicles including cars, trucks, motorcycles and ATVs.

• Direct-burial probe senses mass metal in motion, not radio or infrared.
• Approximately 12 ft. detection radius around the buried wand.
• Wired connection to the gate opener control box ensures reliable triggering.

Where and how should I install the probe for best performance?

Install the probe beside your driveway within the property, trenching the 100 ft. cable and burying the wand no deeper than 12 inches for optimal field reach. Position the wand so vehicles pass through the detection field as they exit; typical placement is a few feet off the driving surface toward the property side. Wiring runs back to the control box can be between 3 and 100 feet per the product specifications.

• Trench and bury probe up to 12 inches deep, parallel to driveway edge.
• Maintain 3–100 ft. cable run back to the control box for flexible placement.
• Place probe on the property side so exiting vehicles cross the detection zone.

Can I use the FM140 with my current Mighty Mule gate opener and what gate types are supported?

The FM140 is compatible with Mighty Mule control boxes designed to accept a wired driveway sensor input and supports both single and dual gate configurations. It integrates with the gate opener just like the factory wired exit sensor, providing a simple and reliable free-exit solution for vehicles. For wireless needs or different cable lengths, Mighty Mule offers alternative models.

• Works with Mighty Mule openers that accept a wired sensor connection.
• Supports both single and dual gate systems for flexible installations.
• Available in 50 ft. and 150 ft. lengths or a wireless FM130 option if preferred.

What maintenance and reliability can I expect over time?

Once properly installed and sealed in place, the FM140 requires minimal upkeep beyond occasional visual checks of the cable pathway and control-box connections. The buried probe design protects the sensor from weather and debris, while the hardwired connection reduces interference issues common with wireless alternatives. Periodic testing after storms or heavy ground work is a good practice to confirm continued detection performance.

• Low-maintenance buried wand built for outdoor conditions.
• Hardwired connection reduces signal interference versus wireless units.
• Simple periodic testing ensures the detection field remains effective.

Who is this for: The FM140 is aimed at homeowners, property managers, and small facilities using Mighty Mule automatic gate openers who want a dependable, hands-free exit solution for vehicles. If you prefer a wired, low-interference sensor that can be positioned up to 100 feet from the gate and buried beside a driveway, the FM140 offers a practical, DIY-friendly option that works with both single and dual gate setups.