Apart from fancy 3D scanner and printer, fancy pens, watches and cameras, another brilliant hi-tech idea is a bit closer to home. Yes, we are talking about a smart doorbell. You probably wonder, how smart can a doorbell be? Well, the new iDoorCam one transmits video and audio over your home WiFi to your cellphone, enabling you to answer the door, even when you are not around. You can create groups for multiple people, or can decide not to answer the doorbell and leave it to the babysitter when in a romantic diner. Or tell the UPS guy to drop the package at your neighbors. Simple, cool and affordable at $165 retail.

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