Jung Ang电子公司的Commax门监视系统装有一个听筒、一个6英寸监视器和一个门锁复位按钮,使用户不用开门就能辨认出来访者。监视器显示黑白图象,系统由双冲程电子配谐、报警系统、电源指示灯、室外监视按钮、呼叫音调音量控制装置、电源开/关装置和屏幕亮度按钮组成。DPV-2 ME和DPV-2 MD为双线型,而DPV-4 ME和DPV-4MD The Jung Ang Electronics Commax Door Surveillance System features an earpiece, a 6-inch monitor and a door-lock reset button that allows the user to identify the visitor without opening the door. Monitors display black and white images, the system consists of two-stroke electronic with harmonic, alarm system, power indicator, outdoor monitoring button, call tone volume control device, power on / off device and screen brightness button. DPV-2 ME and DPV-2 MD are two-wire type, while DPV-4 ME and DPV-4MD