1、One of these needs to be in the basement and 1 on the upper/main floor...will this work? Could this work between 2 houses within a hundred yards of each other?
Yes. The intercom can work for 1500 feet . so this can work your between 2 houses within a hundred yards .
2、If there are 6 units, how many intercoms and ac power adapters in the package? I am seeing is that it has one intercom and 1 ac adapter? I'm a bit confused.
One intercom has one AC adapter. Please feel free to contact us if you have any questions.
3 Can you block the monitor function to keep someone from listening?
The monitor function is in the room your in, meaning the room that is being monitored has to be the one that turns it on. It also lights up so you know its on monitor.
4、Does ot have battery backup?
Hi, it does not have battery backup. You can plug the intercom into outlet directly.
5、How many of these can work together?
It is expandable , they can work as many as you can .
6、How many stations can you add? For example: could I buy 2 sets of six and have a total of 12 in different rooms of the house?
Actually, you can add hundreds stations in your hundreds rooms. They can work together. But our per set only have 10-channel, if you want to talk point to point (others didn't work together). they can total support 10 rooms. Thanks.
7、I am looking for something to monitor aides that care for an elderly family member in another part of the house. Will this do it?
Dear, our units have monitor mode and VOX mode, it can talk and monitor elderly people. Thanks.
8. Can you change the ringtone? the reviews i've read say the ringer on hosmart intercoms are very loud and i need to be able to turn it down.
Yes, this is new version intercom , it can change the ringtone and this unit have 4 different chimes.