Radio Shack 43-968 - Manual (Page 5)

5
This system has been tested and found to comply with all
applicable UL and FCC standards.
We recommend you record the system’s serial number
here. The number is on the label on the bottom of the sys-
tem.
Serial Number _____________________
READ THIS BEFORE INSTALLATION
Your caller ID system conforms to federal regulations, and
you can connect it to most telephone lines. However, each
device you connect to the phone line draws power from the
phone line. We refer to this power draw as the device’s
ring-
er equivalence number , or REN. The REN is on the label on
the bottom of the system.
If you are using more than one phone or other device on the
line, add up all the RENs. If the total is more than five, your
phone might not ring. In rural areas, a total REN of three
43-968.fm Page 5 Monday, August 16, 1999 3:56 PM