No, as Sam says, they are paired. What happened in my pump training session (6 of us sat around a dining table), was that we paired our monitors with our pumps, and that was the only thing they talked to. The only problem we had was that mine wouldn't talk to anything...and sometimes, if people got a bit close, they couldn't connect at all either....but there was nobody getting false messages from anybody else! I have noticed, that if I do a sneaky blood test, say in the theatre etc, and I am close to lots of others with blue tooth devices, it does make connecting the pump and monitor difficult though.