Many advanced features (intercom by handset #, monitor a handset in a different room, etc.)...We typically put phones back on the cradle -- but when not used, battery life has been great -- a problem we had with our last system.I believe the system limits to six handsets, FYI.
This Is one of the best phones i have owned in long time. The sound quality is very good. This cordless phone blows the other Panasonic phone i bought last year way. There is nothing i don't like about this phone.