A: Dear Valued Home Depot Customer,
We reached out to MFG for more information and below is their response.
“The ringer equivalence number (REN) is a telecommunications measure that represents the electrical loading effect of a telephone ringer on a telephone line.
Model RG-4 boosts ring to 4 REN and the RG-10A boosts ring to 12 REN.
http://www.homedepot.com/s/VK-RG?NCNI-5 "
Thanks
The Home Depot User Generated Content Team
