This device is fully developed by the Chinese most leading thermal sights company . Compact design, light weight and simple to use. English User Interface, English user manual. It belongs to the same L3 series as L335, this is the lower version with 25mm focal length. The rest shares same characteristics as L335. L325 uses one unit of 18650 battery, 8 hours of max working time. Please notice this product can endure -40C degree operation temperature.