Doro 820 - Manual (Page 30)

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REN (RN for New Zealand)
The REN (Ringer Equivalence Number) or (RN) is of signifi cance only if you wish
to connect more than 1 telephone to your telephone line. A standard telephone line
has a maximum REN capacity of 3 (RN of 5). It is possible to connect 3 devices with
a REN of 1 (RN of 1) with no degradation to the product’s performance. Exceeding
this limit may cause the volume of the ringer in any phone to decrease or not ring at
all.
Electro Magnetic Radiation (EMR)
This telephone complies with applicable safety requirements for exposure to radio
waves.
The mean power of this telephone is not greater than 7.9 mW.
This is below the 20mW limit at which testing is required.
Answering Machines
Please note when set to answer after 2 rings this product may block CID information
when used in conjunction with certain distinctive ring signals (FaxAbility).