Previously you could only buy door viewers in the shape of a wide-angled peep hole, now there are many more models on the market. Modern door viewers often comprise a display or camera unit that clearly lets you see who is outside your door. Feel secure knowing who is outside before you open the door. Besides door viewers we have other more advanced models of security cameras to choose from. With the aid of a security camera you can follow what is happening outside your entrance or door and by connecting the camera and the rest of your security system to an app in your phone, you can check what is happening no matter where you are.