This isn't the first time thread about one of these, but this is a first hand review of the one I got off of Amazon. There are many to choose from, but I went with the price ($20 at the time) and the 230+ positive reviews. It works on Androids, iPhones and computers via WiFi. I like this because once you use it, you'll appreciate not having to juggle with holding the phone while manipulating the camera cord. It creates it's own WiFi signal (separate from your home network) and comes with an easy to use App. This is a no brainer must have! Look at the images and read the specs on Amazon...I didn't (trigger happy) and was pleasantly surprised that it came with a nice case, accessories and quality features/specs. I had this up and running right out of the box within a minute - www.amazon.com-Smartphone-Inspection-Camera Here are some photos that I took using it. Sad piston cylinder. Normal piston. 40 caliber pistol...It wouldn't fit in my AR15's barrel (duh...The camera is 8mm... I didn't know that until today). Some images of the camera size. Awesome LEDs (low setting pictured so you can see them). Video.