Aldred said it was a “frightening” time when his father was diagnosed and was “like the unknown”.
“We asked people what they were worried about and people were saying about their loved ones going missing; that’s the biggest fear,” he said.
Aldred’s device – which can be worn on the wrist, attached to a bag handle or zip, pinned to clothes or attached to keys – does not have any subscription charges.
“With these, once you’ve bought the device, the information that’s in there is live all the time,” he said.
“Each buddy contains a simple contactless chip, like the tech you use in your phone or bank card.”
A quick tap gives instant access to the wearer’s emergency information.
The trust said it was important to work with emergency services from the start.
Aldred said: “Most people if you find someone is confused you contact the police.
He said in his experience with his father, the safest place that the police can hold that person until they find out they’re missing is in a cell.
But this can be incredibly stressful for people with dementia, so the device aims to address that and help reunite them with loved ones sooner.