Radio Shack ET-554 - Manual (Page 4)

4
READ THIS BEFORE
INSTALLATION
We have designed your ET-553/ET-554
to conform to federal regulations, and
you can connect it to most telephone
lines. However, each device, such as a
telephone or answering machine that
you connect to the telephone line, draws
power from the telephone line. We refer
to this power draw as the device’s
ringer
equivalence number, or REN. The REN
is shown on the bottom of the base.
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, your phones
might not ring. In rural areas, a total REN
of three might impair ringer operation. If
ringer operation is impaired, remove a
device from the line.
FCC STATEMENT
This telephone complies with Part 68 of
FCC Rules. You must, upon request,
provide the FCC Registration Number
and the REN to your phone company.
These numbers are located on the bot-
tom panel of the base.
Note: You must not connect your phone
to any of the following:
• Coin-operated systems
• Party-line systems
• Most electronic key phone systems
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