Sonic Alert TR55の取扱説明書

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FCC Information
We designed your telephone signaler to conform to federal regulations, and you
can connect it to most phone lines. However, each TR55 (and other devices,
such as a phone or answering machine) you connect to the phone line draws
power. We refer to this power draw as the ringer equivalence number, or
REN. The REN is on the TR55 rating label.
If you use more than one phone or other device on the phone lines, add up all
the REN’s. If the total is more than five, Phones might not