It is the FreeStyle Libre, which has a small needle and a radio. The provided reader is not the most accurate, but you can read the results with any NFC enabled device. For Android xDrip plus is my choice and I've already contributed new features.
A disclaimer: do not use any of these if you don't know exactly what you're doing. If you do acknowledge the risks and have some backup system for measurements, this system is making the life of a type 1 diabetic much easier...