Anxious that you might face an armed home invasion, or that your kids might find the key to the gun cabinet? NanoWatt Design thinks it has a way to give you that crucial early warning. Its crowdfunded GunDetect camera uses computer vision to detect firearms and send a text alert to your phone. If it works as promised, you'll know there's an intruder at the door, or that you need to rush into the den before there's a terrible accident. If you're intrigued, it'll take a minimum $349 pledge to reserve a Cloud GunDetect (which requires a service subscription to process images) and $549 for a Premium model which does all the image recognition work itself. Provided that NanoWatt reaches its funding goal, both cams should ship in February.