1. Manually switchable 10-positions Dot Brightness with 2 way pressure switch. 2. Turning on or off the power can be operated on the pressure switches marked with Λ or ∨. 3. Press either switch for 2 seconds to turn off the power. 4. To increase the brightness, press Λbutton, to fade down it press the ∨button. 5. The power can be shut off automatically after 5-hours inactivity. 6. When to operate the sight, its red dot turns on at the same level as that before its power turned off.