So you would like to see who is knocking on your door from your smartphone? The RCA WiFi Doorbell Camera can help. It connects to your network and lets you see and speak with the visitors from anywhere using the RCA Security app. The camera has a 180-degree field of view and customizable field of motion.
The doorbell camera has built-in speakers and a microphone. It records up to 700 x 20 second events to Micro SD cards up to 128GB. Up to 4 different faceplates are available for it. Sets you back under $150 at this time.[HT]