RioRand 3.5 inch 170 Degrees Wide Angle Peephole TFT LCD Digital Door Viewer Doorbell Security Camera Cam Powered by RioRand Advanced Technology 3.5 inch color TFT LCD panel display, 320 x 240 screen resolution Uses CCD or CMOS image sensor Monitor the situation out of the door, press monitor button to turn on the display to see outside anytime Alarming function ;Ring indicates the visitor's coming.