For folks interested in seeing who is on their doorstep without having to change locks, there was SkyBell.
The Internet Age doorbell connects to the same wires as its simpler predecessors, but has a built in camera and synchs to Wi-Fi to stream real-time video of who is ringing to a resident's smartphone.
It also has motion sensing and night-vision, so it can transmit images even when visitors arrive in darkness, according to SkyBell's Kelly Stewart.
"You can see and hear and talk to them," Stewart said, of visitors both welcome and not. "If a robber is in front of your house the motion-sensor will alert you, or if your daughter tries to sneak in after her curfew."
SkyBell users have the option of capturing screen shots of visitors. SkyBell, launched by the California-based company at CES, is available in the United States at online merchant Amazon.com for $199.
