Although pricey at $319.95 to start the AF-850 low band model sure would be a great replacement for the old tried & true Plectron, Motorola & Federal Sign & Signal alert monitors & no crystals to replace when a frequency change occurs.
Dayton Industrial Corporation Product Reference
www.daytonindustrial.com/Manuals/850Man1.pdf
Dayton Industrial Corporation Product Reference
www.daytonindustrial.com/Manuals/850Man1.pdf