Every detail of the NiteCore D20 was considered in depth. The result of which is no less than a work of art. The shape and functionality of the NiteCore D20 was considered without compromise and engineered with duty and durability in mind. Every cut angle, the size and shape of the knurling and materials and finish are all the result of uncompromising design decisions. This is inline with NiteCore's philosophy of striving to put unique and the most innovative products into the hands of consumers like you! Featuring a redesigned optical system that maximizes the number of photons that you get out of the business end while retaining a perfect beam pattern. The NiteCore D20 is the first 2x AA SmartPD flashlight.