Caregiver alert buttons. Any recommendations?

Since removing mom from care facility, we installed baby camera monitors with audio/visual devices for me should I be doing laundry, etc. Problem: either I'm a sound sleeper OR mom's voice is just to soft or her "tone" doesn't wake me. Anyone have a recommendation for a Caregiver, push button style? She has dementia. She has quit eating but continues to drink the shakes, medipass and milk. She doesn't talk a whole lot. This is her 3rd night, my second fail to wake and my sister had same issue last night. I see they make them but a review/recommendation from one of you would be awesome