The 412L uses 2- AAA batteries (included). This IRT is ideal for users that need a range of a whopping 48 inches or less. A very large step up from the lower 5:1 and 6:1 D:S models from the leading competitors. Temperature range is -76 to 932 F or -60 to 500 C. Emissivity is preset at .95. Probably the nicest feature of this unit is the “always on” MAX mode. This shows you the maximum reading and the actual reading while you scan the enclosure-giving you the basking and background temps all at the same time. 179 grams with batteries.