Cons: Although it's portable, it's a bit bulkier than some of the other top cordless heaters. Check Price: DeWalt DXH12B Cordless Propane Heater ... because the rechargeable battery can last ...

This lozenge shaped device is not only a USB ... the battery and the rest of the board, so it stands to reason that the final 14-pin IC must be the microcontroller in charge of the heater aspect ...