Description describe: SC31 Pro is upgraded from SC31B whats the difference -Anduril user interface -Rolling machine line typc charging port -SST40 max 2000 lumens -Tail cover with lanyard hole Specification: * 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 aluminum alloy, high-quality Type III hard anodized wear-resistant surface, strong body, anti-collision. Tempered mineral glass lens * Anduril firmware 2020-03-18 * Mode memory: It saves the last brightness 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 reaches 45C, the brightness is automatically adjusted to prevent the light from overheating. You can reset the temperature limit. * Low voltage protection LVP makes the light drop to low level when the battery voltage is lower than 2.8V, and turns off when the light has dropped to the lowest level. service: Open close Click the side switch to turn the light on/off. Change the brightness Hold to increase or decrease SC31 Pro uses the same firmware as SP36 BLF Anduril (2020-03-18 version) This product uses copyrighted code released under the GNU Public License v3 (GPLv3).