The indoor and outdoor housings have been improved to withstand a variety of environmental conditions, and they feature alarms and relays for direct wiring to nearby sensors.
相机室内和室外外壳已得到改善，能经受各种环境条件考验，它们能将警报和继电器直接连线到附近的传感器。
Not to direct mass Mohui wiring layer, because the change that is not conducive to the later line, but also very safe.
不能把电线直接埋入抹灰层内，因为这样不仅不利于以后线路的更换，而且也很不安全。
No need of wiring, direct testing, convenient.
不需绕线，直接测试，方便。
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