On Saturday, July 4, 2015 at 1:01:35 PM UTC-5, RogerDoger wrote:
Harbor Freight Wireless Security Alarm System Item 93068
Been working for years indoors only.
Recently the range has diminished.
new batteries installed but still does not regain original range.
It works but distance between unit is less.
Was 40 feet now only works at 30 feet.
Using both inside between rooms.

What can cause this lose in range?

Item 93068 9V at transmitter, 3 C at receiver.

Jeff's response is perfect!