Even traditional companies like ADT have self-install options, and some home security systems specialize in DIY options. Here's what we've found.

There’s no audible alarm; rather, an LED blinks to indicate an unauthorized intrusion and blinks once for every 15 minutes since the event. LightSafer is simple but effective, with a clever UI ...

Say, turning it into a free, effective indoor home security camera? That's an especially good idea if you won't get much cash back for a trade-in. And all you need is one simple app download.