Keep the MM-240 MicroMax Plus from Carson Optical in your pocket, and you'll be able to transform your Samsung Galaxy S4 into a digital microscope at any time. When it's affixed, you can capture close-up photos and video with powerful magnification of 60-100x. To get started, simply attach the provided adapter case to your phone and open up the camera app. For those times when you're photographing in low-light or fully dark environments, there is a built-in LED light to help you get the perfect shot. A knurled focus knob makes it easy get clear images and a separate zoom dial gets you to your desired magnification level; or you can just use the zoom function on your phone. Remove it from the adapter, and you can use it as a pocket microscope and view with just your eye.