Hearing door access upstairs?

Our base has to be on the first floor as it covers the basement/first floor access points (windows and doors) but we'd like to be able to hear if the doors open (say in the basement -- perhaps from teenagers wanting to sneak out, for example!) But as I understand it - the only way to hear the chimes is to move the base station upstairs to the second floor - which we can't do, obviously because the windows and doors on the first floor and in the basement are what we're trying to monitor!  Is there any way to hear a chime other than from the base station? When I asked this initially I was told the key pad would chime so I bought an additional key pad to keep in our bedroom but it turns out that is not accurate and it can just activate and deactivate the system.... 

In short- we are not so much keeping people out, but wanting to keep taps of keeping kids and friends IN during sleepovers and such -- hahahah....  Thanks so much!