SOFIRN SK40 The SK40 is a powerful tactical flashlight that can reach up to 580m, with clicky tail switch and side e-switch, having both duty mode and tactical mode to meet your different needs. Description 1. Super Brightness & Long Distance - SOFIRN SK40 is equipped with 1*SFT70 LED, with a maximum brightness of 3200 lumens and an illumination range of up to 580 meters, which can easily meet the long-distance lighting needs of outdoor adventures, search and rescue missions, etc. 2. Dual switch