Here is another video doorbell that lets you monitor who is knocking on your door. The iseeBell WiFi Enabled Video Doorbell comes with an iOS / Android app to show you a livestream of all the action. It has a 185 ultra-wide angle lens to record 720p video. It has night vision mode, so you can see even in dim lighting conditions.
The unit has motion detection to capture activity as they happen. iseeBell comes with bank grade encryption.