Didn't stress test but I can say it's easy to put on and works for at least an hour extra (so I used it often). I mainly use it at night when I'm leaving so people know I'm a team player (and also so friends can find me quickly when we're playing in a crowd and we're separated because we're going in different directions to look for different ones looking for Pokemon). One thing that struck me as odd is that it has a metal "button" with a hole on one side that looks like a buttonhole (like the kind you use to keep your coat "buttoned") . '), but there is nothing on the opposite end of the bracelet that can be used for that purpose. I didn't understand why that is, but it's not really a big problem. But yeah it's quite big and the circle can be quite small so I'm pretty sure people of all sizes can use it. I don't have it with me at the moment so I can't confirm if it's suitable for toddlers or not, but I can assure you it's suitable for almost any teenager or older. obviously it can be used by pulling it up - that makes it upright. Then you tap his wrist and he wraps himself around it. You can flip the hidden switch under the surface to get a solid light. Click it again to make it blink. And you click it a third time to turn it off.
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