describe:SC31 Pro is upgraded from SC31Bwhat's the difference?-Anduril user interface-Rolling machine line typc charging port-SST40 max 2000 lumens-Tail cover with lanyard holeSpecification:* Working voltage: 2.8V-4.2V* Transmitter: single SST40 powerful LED* Battery support: one 18650 lithium ion battery* Dimensions: 117.5mm (length)x 25.4mm (head diameter)* Net weight: 59g without battery* Made of Aircraft 6061-grade aluminumalloy, high-quality Type III hard anodizedwear-resistant surface, strong body, anti-collision.Tempered mineral glass lens* Anduril firmware 2020-03-18* Mode memory: It saves the lastbrightness level used in normal mode.When you turn on the flashlight next time,it will activate the last brightness you selected.* Advanced temperature control (ATR) technology:When the temperature of the light reaches45C, the brightness is automatically adjustedto prevent the light from overheating. You canreset the temperature limit.* Low voltage protectionLVP makes the light drop to low level whenthe battery voltage is lower than 2.8V, and turnsoff when the light has dropped to the lowest level.service:Open closeClick the side switch to turn the light on/off.Change the brightnessHold to increase or decreaseSC31 Pro uses the same firmware as SP36BLF Anduril (2020-03-18 version)This product uses copyrighted code releasedunder the GNU Public License v3 (GPLv3). Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.