Illumination Precautions•The LED that provides illumination loses power after very long use.•Illumination may be hard to see when viewed under direct sunlight.•Illumination turns off automatically whenever an alarm sounds.•Frequent use of illumination runs down the battery.Auto light switch precautions•Wearing the watch on the inside of your wrist, movement of your arm, or vibration of your arm cancause frequent activation of the auto light switch and illumination of the display. To avoid running downthe battery, turn off the auto light switch whenever engaging in activities that might cause frequentillumination of the display.•Note that wearing the watch under your sleeve while the auto light switch is turned on can causefrequent illumination of the display and can run down the battery.•Illumination may not turn on if the face of the watch is more than 15 degrees aboveor below parallel. Make sure that the back of your hand is parallel to the ground.•Illumination turns off after the preset illumination duration (page E-96), even if youkeep the watch pointed towards your face.•Static electricity or magnetic force can interfere with proper operation of the autolight switch. If illumination does not turn on, try moving the watch back to the starting position (parallel with the ground) and then tilt it back towards your face again. If this does not work, drop your arm all the way down so it hangs at your side, and then bring it back up again. • You may notice a very faint clicking sound coming from the watch when it is shaken back and forth. This sound is caused by mechanical operation of the auto light switch, and does not indicate a problem with the watch