Temperature control circuit, in the case of low water temperature, can cut off the drive power protection device, in the case of high water temperature, open the cooling fan cooling.
水温控制电路，能在水温低的情况下，能切断驱动电源保护装置，在水温高的情况下，开启散热风扇散热。
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The patent reads: A self-contained open-circuit breathing apparatus for use within a body of water naturally containing dissolved air.