The MURS Alert transmitter is a revolutionary new trail monitoring system. The MURS Alert transmitter is a passive infrared sensor that can be mounted on a tree or a post to monitor activity at remote locations. When the MURS Alert detects people, vehicles, or large animals, it will send an alert signal to either the M538-BS or M538-HT transceivers. The alert signal will be in spoken English, twice repeating the phrase "Alert Zone One," "Alert Zone Two," "Alert Zone Three," or Alert Zone Four." The four alert messages are easily selected at the transmitter so that up to four different zones can be monitored simultaneously.