With its easy handling, the robust aluminium housing with low-noise rear switch for momentary or continuous light and 500 lumens of light output, the SDL350 is the ideal companion in nature or for night-time use. The SDL350 is supplied with 2 batteries type CR123, but can also be operated with a rechargeable battery type 18650. Housing diameter 1" (25.4 mm). Waterproof according to IPX4.