It's a matter of debate, of course, but for the average homeowner today, we think there's no better security camera than the small-but-mighty Nest Cam. With around-the-clock video streaming, the Nest Cam gives you a wide-angle, 130-degree view into your home—a view you can access from anywhere, any time, via computer or mobile device. The camera even includes audio capability, so you can listen and talk through it, greeting the children when they get home from school, for instance, or chastising the dog for sitting on the couch while you're gone. Even better, if Nest Cam detects any unusual activity, you get an instant alert right on your smartphone or tablet. Available at Amazon; $194.