Radio Shack CID-2904 - Manual (Page 5)

5 Important Information
FCC INFORMATION
We have designed your Caller ID (CID) to
conform to federal regulations, and you
can connect it to most telephone lines.
However, each CID (and each device,
such as a telephone or answering ma-
chine) that you connect to the telephone
line draws power from the line. We refer to
this power draw as the device’s ringer
equivalence number, or REN. The REN is
on the bottom of your CID.
If you use more than one phone or other
device on the line, add up all the RENs. If
the total is more than five (three in
rural areas), your phones might not ring. If
ringer operation is impaired, remove a de-
vice from the line.
Your CID complies with Part 68 of the
FCC Rules. You must, upon request, pro-
vide the FCC registration number and the
REN to your phone company. Both num-
bers are on the bottom of the CID.
You must not connect your CID to:
• coin-operated systems
• party-line systems