Has anyone used the GPS tracking units available for rent from Orlando Stroller Rentals? I was looking at their strollers today, and I saw this at the bottom of the page. I'm always terrified that my son (with autism) will get away from us and get lost. I would love to hear anything about these units - they seem to be pretty small, are they really? Is it hard to keep them attached to your child?
Can they get wet? Thanks!
Also, has anyone rented the City mini GT for a 4 year old? Do you know if they are roomy enough for comfort?

Also, has anyone rented the City mini GT for a 4 year old? Do you know if they are roomy enough for comfort?