There are 3 adustable Levels Temperature Settings,Red(high): 3~3.5 Hours,Orange(middle): 4.5~5 Hours,Green(low): 6~6.5 Hours.Please charge the batteries about 12 Hours to activate for the first time use
If your feet always feel cold ,this socks is a pretty choose for you, and also great for hunting, ice fishing, hiking ,sleeping, skiing ,Climbing ,Camping ,mobiling outdoor indoor activities .
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