• 1.Use a battery cover opener to loosen the knob that secures the battery pack cover (Counterclockwise rotation, the groove of the knob should be vertical).
  • 2. Remove the battery pack cover.

  • Please be noticed to use the battery cover opener instead of the general screw driver. Using screw driver can
    cause damage on the screw.
  • 3. Take the battery pack out of the detector.