Awakingdemi 3.5 inch LCD Peephole Viewer Door Eye Doorbell Color IR Camera Note- Before buy it, you needs to purchase the 4pcs AAA batteries 1.5V battery to power it up,then it can work on.Please install the battery correctly (batteries not included) EASY TO INSTALL:Short press to turn on, long press to turn off.Replace the battery without dismantling the host and the Peephole24 hours monitoring SUPER TFT DISPLAY:OV Industrial High Definition Color Image Sensor,3.5-inch LCD color screen display, easy and clear to read 2 Mega CMOS Sensor,120 degree actual viewing angle 24 hours monitoring