We ordered 6 and non works ( RCA RDR23x0 Series). Literally had it troubleshoot with them for over 2 hours ( over two days). I found it here online buy called for the order ( https://www.rcacommunicationssystems.com)
Guess what - the tech was telling me that the product is the brain child of the owner; knowing well it is not tested enough. When I asked to speak to him to ask for a refund the tech told me "Ben doesn't do refunds" and hung up!
RCA should be ashamed letting their vendors ruin their name like this!