1.Easy to turn on.Elastic strip fit for ALL SIZE.
2.Adjustable size so it fits well.You and your children can both wear them cuz they are adjustable for any size.
3.Multi-function. It can be wear on your wrist, arm,leg,ankle,bicycle or bag.
4.Extra batteries included.Battery access is easy to change.It needn't take a surgical procedure to change them out ;
5.How to clean? Pull off the controller which means rubber strip, the circuit boards and the battery.
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