Have also got two bt ones that work fine - make sure you label both parent bits though so you know which child has which monitor. Grizzling in the night they can sound quite similar and you don't want to go in and disturb the sleeping one!
Not sure if this is the right place to post this, but I was wondering if you can run two baby monitors in the same house? DS1 is 3 years old, but we still use his monitor until we go to bed, as our house has concrete floors/ceiling and we can't hear him if he cries or calls for us. He also won't ever get out of bed, so if he wants a drink etc he calls for us. DS2 is 1 month old and currently in scbu as he was born at 31 weeks. When he comes home we'll obviously want to use a monitor.
We currently use the Phillips Avent digital one and thought about buying a second one for DS2, but will they both work in one house? Thanks!