1.Function of video interphone when visitors coming 2.Monitor outdoor circumstance and interphone function 3.Function of taking photos/video for visitor who press the doorbell; 4.Function of taking photos/video for moving object indoors;(additional camera is needed) 5.2.4GHz (4 channels) wireless detect video function;(wireless baby monitor) 6.Lay/withdraw detect with a wireless remoter(open/close motion detect function); 7.Optionally be equipped with telephone dial machine to do telephone alarm; 8.The function of VRD inside digital motion detect module as follows: (a)When moving object appears, it will take a high definition photo/video for it; (b)The image recorded with detail time(includes year,month,day,hour,minute and second) (c)Standard collocate 128MB sd card, can store 2000 images/400 video clips(10 seconds/clip) (d)Support max 2G sd card, can store 28800 images/4380 video clips(10 seconds/clip); (e)When the sd card is full, the images will be covered by principle of "first in,first out", video/photo non-stop forever; (f)The images/video clips stored won't lose when power off; (g)It can send a trigger signal automatically to start-up other alarm system when moving object appears, such as telephone alarm function; (h)Perfect operation interface. Can do individuality by intercalate the time,date,motion detect open/shut,sensitivity,time interval,detect range as you like. (i)Built-in four channels 2.4GHz wireless receiving module, can receive wireless video signal;