It is totally new flashlight but without package box.
No included free warranty service.
1. Battery installation: Twist the tail to loosen and remove the tail, then insert the battery with the positive end toward the head.
2. Flashlight turning on/off: Press the tail switch to turn light on/off
3. Output selecting
a) Screw the flashlight head: Press the tail switch to High mode.
b) Unscrew the flashlight head: Press the tail switch to Strobe mode.
C)Screw or Unscrew the flashlight head to transferring mode, circulate as High—Strobe—Low.
Momentary-on function: Gently press (no click) the tailcap push button switch.