EAGTAC T25L-R 2050 Lumen USB-C Rechargeable Flashlight 1x18650 Battery Cree XHP 35 HITurn on the flashlight by pressing the tailcap button until it clicks. Twist the head to select between three output levels. You can pre selected any output level before turning on the light. Advanced: Tail strobe feature (off by default): Switch to 1st level and turn the flashlight on and off 20 times (one second or less between each click) to toggle this feature. With the tailcap strobe setting enabled, a double press of the switch button (within