Window sensors are a critical part of any home security system. Learn how they work so you can ensure this last line of defense is there when you need it.

The Sony A7R II has a Back Side Illuminated Sensor. How does this work and why is it better?Here's the run-down on back-side illuminated sensors (like those in the recently announced Sony cameras) ...

The wearable sensor does the same thing, though the current is smaller, he said. The pill is designed to work for only about 3 minutes.