Revo RECBH0550-1 - Manual (Page 18)

AUTO WHITE DEFECT
Push the left button for 5 seconds and enter Auto white defect menu.
Cover the lens and Enter for starting.
If white defects are over 65pcs, the camera is faulty and auto defect is
useless.
Over 70'C Auto white defect can't be activated.
LENS ADJUSTMENT (OPTIONAL VARIFOCAL LENS)
12