Mighty Mule Driveway Alarm (FM231)

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