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They look like an ordinary light bulb, but do so much more to keep your home safe. These LED bulbs from BeON house a module with a microphone and a rechargeable battery that allow you to program the bulbs to light up in response to the doorbell ringing. They also provide up to four hours of emergency lighting when the power goes out.
Screw them into any light fixtures, then download the BeON Home app for smartphones or tablets that have Bluetooth 4.0 to program them; no wifi is required.
A set of three bulbs is $199 on Amazon.
– Jan Schroder, The 100 Companies