I found this on my local carers support centre website. It is only available locally in small numbers, but an interesting idea for anyone in Bristol, Bath and surrounding areas. It would interesting to see if it available elsewhere.
New dementia safety wristband | Carers Support Centre
A tech wristband for helping people with dementia has been launched in Bristol, Bath, Somerset & South Gloucestershire.
www.carerssupportcentre.org.uk