Step Ramp: 3 clicks from button when the torch turn on. One click represent the brightness mode. With several clicks, The brightness will reach turbo. Anduril UI operation system is a little complex for novice. Please read manual carefully to know the various mode before you use it. Smooth Ramp: Hold side switch, Brightness of the flashlight will rise from moonlight to turbo. You will clearly notice the difference. Vice versa. The brightness will go down when it reach the turbo mode. Only with a click on smooth ramp, you can stay on whichever mode you want. Battery Indicator: Side switch is also the battery indicator. Red light will flicker when you need to charge it. If the battery capacity is above 50%, Then the side switch illuminates green light. The torch has protection function, it will protect torch from over-charging and undercharging. USB C Charging Port: SP36 flashlight designed with built-in usb charging port. You can recharge the flashlight conveniently with the USB cable and power bank(not included. The rubber cap above the charging port also protects the flashlight. High Power Torch: 8000 lumen torch throws light 423 meters away, Bright enough for outdoor hiking and camping. SP36 Pro is the upgraded version with cold white tint. Weight:300g without battery Size:126.7mm*50mm(length*head) Tint: 6500K (cold white) Luminous Flux 8000 Lumen Material Aluminium Light source type LED Power Source Battery Powered Brand Sofirn Before using it, please remove the the insulation plastic disc from the positive and negative electrodes of the battery.