The home security device that's always listening

For Airbnb hosts who want to keep tabs on their homes, a full home security system might be overkill. They're expensive, and live cameras and motion detectors invade guests' privacy. So how do they make sure guests keep the volume down, aren't smoking inside and don't ransack their home?

A new device called Point combines microphones with environmental sensors to detect anything out of the ordinary in your home while you are away. A broken window while you're at work, the sound of your teenagers throwing a raging party, Grandad sneaking an unauthorized after-dinner cigar.

"They want to have peace of mind and know that everything is fine, but they don't want or need full security systems," said Nils Mattisson, co-founder of Form Devices, the start-up that makes Point.