To protect its children, just about every school keeps its front door locked these days, but has a doorbell and a remote electric lock to let visitors in. But, those in the front office can’t tell who’s at the door to decide who to let in. D-Link’s DWM-351 3G Door Phone combines a doorbell with a surveillance camera so those in the office can see who’s at the door and whether to let them in. The best part is that it directly replaces an existing doorbell and rather than having to run Ethernet cables to the door, the 3G Door Phone connects via the wireless phone network. It can capture and stream100,000 pixel images to a computer in the office or the cell phone of a security guard.