My Dad has Parkinson's and sometimes he cannot make himself heard. We have a baby monitor but sometimes my Mom is out of the room and can't hear it. Is there a device that would not require my Mom to carry something around with her? The idea is to give Dad a device that he can control regardless of whether anyone has a monitor or cellphone within reach. I am thinking of a pendant or bracelet with a button that would make a loud beep. I don't want an alarm that will scare the daylights out of anyone. Any suggestions would be appreciated.