I have a special needs daughter who rides the bus. Last week, she arrived home 90 minutes late. During that time, I did not know where she was and I was placed on hold with the school district's transportation department. I later found out that the bus broke down. I could have easily picked her up if someone had just called me (we live less than two miles from the school). I was not satisfied with the lack of communication and didn't want to experience this again, so I purchased Trax Play. I LOVE IT! It comes with two different silicon holders, one with a clip and one without. I use the one without the clip and thread it through a sewn-in strap on the inside of her backpack to keep it safe. I didn't want a watch or a phone because that is too much gadget for her and a watch would just be a distraction that she would fiddle with during class. This little beauty is perfect for what we need at this point in our lives. FYI, in order to activate, you need to purchase a monthly service fee (6 month or 12 month plan) through the Trax Play website.