Another day has gone by and the device has malfunctioned.This is only the second time it was used.The first time the device was used.It got extremely hot and it was no too dangerous to use on my son.I called the mfr and they exchanged it for a new one.The new device is exhibiting the exact same behavior.Batteries go into the device and it makes a rattling noise and gets warm and then hot.Fortunately after the first experience, i was careful to monitor the device on my son.I discontinued use after 20 mins.It is so hot i can't even hold it in my hand.
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