So... we are on holiday. And for the second year running our non-verbal, no danger awareness, non-verbal but very physically capable DC has done a runner repeatedly out of the holiday accommodation as we can't lock the door from inside. We have set up crazy barricades with suitcases and ironing boards but it's made it impossible to relax. It's terrifying. And we can only imagine it getting worse with age. It never happens at home as we have things secure but we need to be able to stay away for other DC.
Can anyone recommend a GPS bracelet sort of thing that cannot be removed?