Mighty Mule Interior Wireless  Replacement/Additional Driveway Alarm Base Station for Mighty Mule Outdoor Motion Detectors - Compatible with Mighty Mule Automatic Gate Openers - Black, FM231-R

Add this additional receiver to the Mighty Mule wireless driveway alarm (model# fm231wb sold separately). this additional receiver will announce the arrival of a vehicle by a chime and LED light. This receiver also features a low battery indicator light, notifying you when the 2Aa batteries (not included) need replacing in the outdoor receivers.