Summer pack travel, back sweltering sweat. Equipped with a semiconductor refrigeration module fan to dissipate heat, which can cool the back and achieve the effect of cooling.
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Is this a strong demand?
When climbing
This, yes, if there is no electricity, it will be a practice load
When you go out in winter, you should have a self-warming effect. When you go out in summer, you should have your own fan function. Ha ha, modern people are wonderful.