The utility model has the reasonable design of structure, the controller and the key-press device can not be affected by high temperature steam, liquid can not be flowed into the electric component through the key-press device when the utility model is cleaned due to the button disposed on the inner surface of the key-press device, the utility model has longer service life, improved stability and waterproofness, difficult failure, low possibility of maintenance, convenient cleaning as well as better appearance due to the turnover design of the key-press device.
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