ACR Electronics MS-2000(M) - Manual (Page 7)

Y1-03-0146E 6
Figure 3
e. Blue Light
With the flashguard shield in the retracted (stored) position, slightly
raise the IR filter and rotate it either left/right 90°. Then snap it in
toward the side of the light to lock it into position. While holding the
main body case with either hand, grasp the flashguard shield with
the other hand and pull it up until it stops or a slight locking sound is
detected, then release. This is an indication that the blue filter has
been released and fully engaged to its proper operating position.
(See Figure 4)
Figure 4
Stored Turn On
IR light
Raise Shield Turn ON
Blue light