Radio Shack CID 940 - Manual (Page 6)

6 Features
FCC INFORMATION
We have designed your system to conform to federal regula-
tions, and you can connect it to most telephone lines. However,
each system (and each device, such as a telephone or answer-
ing machine) that you connect to the telephone line draws pow-
er from the telephone line. We refer to this power draw as the
device’s ringer equivalence number, or REN. The REN is on the
bottom of the system.
If you use more than one telephone or other device on the line,
add up all the RENs. If the total is more than five (three in rural
areas), your telephone might not ring. If ringer operation is im-
paired, remove a device from the line.
Your system complies with Part 68 of FCC Rules. You must,
upon request, provide the FCC registration number and the
REN to your telephone company. Both numbers are on the bot-
tom of the system.
Note: You must not connect your system to:
• coin-operated systems
• party-line systems
• most electronic key telephone systems
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