气流调节阀：气流调节扭与挡风板均为高密度PP材质，用304不锈钢方棒连接，手动调节外部阀门旋钮，控制气流量。
Damper: both gas flow regulating button and wind board are high grade PP material, connected with 304 stainless steel bar, manually adjust the outside valve knob, control air flow.
通过控制面板上的调节旋钮可对流量进行手动调节，还带有电源指示。
Constant flow rate manually adjustable by control dial on the front panel, Power-ON led indicator.
该种摄像机可通过手动旋转旋钮装置调焦而满足不同监视现场对焦距的要求，同时制造成本低。
The video camera in the utility model can be focused by manual through the knob to meet the demand of different monitoring sites and achieves a lower producing cost.
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