We received the device on 10/6/2017.The device evaluation is currently in progress.Manufacturers narrative: the heated surface was allowed to run for 2 hours.There is no auto off but the instructions limit use time of heat to 3 minutes.Use time for massage is also limited to 15 min on any 1 muscle.After 2 hours of run time, the maximum temperature reached was 43c (109f).The maximum allowable touch temperature from underwriters laboratories (3rd party test lab) is 55c.We are well within the safety agency touch temperature.Skin sensitivity should always be checked prior to use.Medications and other health conditions can make the skin more sensitive.The temperature of the massager and the use time recommended would not produce any burns.If burns occurred, it was either used for a longer period of time then what is recommended and in addition - the users skin is obviously too sensitive for this device.Root cause: consumer misuse.Use time of 3 min with a temperature under 43 c would not cause a burn on normal skin types.
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