My mum has dementia and lives in her own home with a live-in carer. It's hard for the carer to watch mum 24 hours a day and sometimes mum opens the front door and makes a run for it. However, if the carer keeps the front door locked, mum goes crazy and has a major strop. Understandably - who wants to be locked in their own home?! Does anyone know of an alarm system whereby the carer can carry some sort of bleep, and when the front door is opened, a DISCREET noise/vibration alerts the carer? (I don't want to have a full-scale 1000 decibel siren disturbing the entire neighbourhood every time the door is opened!). I live in the UK and would be grateful for any advice.