Brightness Settings
The multisided knob at the end of the electronics bay (the rectangular part of the Action Light) is a 6-position rotary switch that controls the light brightness. The knob is rotated clock-wise to increase brightness or all the way counter clock-wise to turn the light off. Starting with the Off position, the switch positions are Off, Dim, Low, Medium, High and Overdrive.
The Overdrive setting is very bright but cannot be used continuously due to heat buildup in the LED array. To prevent any accidental damage, the light automatically limits the use of the Overdrive setting to a 20% usage factor and not more than 30 seconds per use. When this limit has been exceeded, the light automatically changes back to the High setting. The Overdrive setting may be reactivated by moving the switch from the Overdrive position to the High position and back to the Overdrive position.
Which setting should you use? We recommend you use the lowest setting compatible with safety and your task lighting requirements as this will provide the maximum battery life.
Adapting to Less Light
The amount of power used is roughly proportional to the amount of light the lamp is producing. Therefore, being able to use a lower setting allows you to conserve battery power. Your eyes respond to light in a non-linear (logarithmic) way and so what appears to be only a slight change in brightness is actually a very substantial change in the amount of light.
You can safely and easily adapt to lower light settings. The light brightness settings were chosen such that if your eyes are adjusted to one setting, you can turn the light down to the next lower setting and still see what you are doing. This makes it easy to use lower settings and thus greatly extend the battery life. Every change to a lower brightness setting increases battery life by about 4 times.
There are many conditions that interfere with low light adaption including fatigue, age, altitude, smoking and illness. Any of these separately or in combination can result in the need for a brighter lamp setting.
Switch Lock
The switch may be locked in the Off setting to prevent accidental operation when being carried or stored. You can lock the switch by rotating the switch fully on and off twice (from Off to Overdrive to Off to Overdrive to Off) within a short period. The light will flash twice to acknowledge entry into the Locked mode.
While in the Locked mode, the light will flash twice whenever the switch is moved to a new position. This makes it easy to identify when the light is in the Locked mode, in case you forgot it was locked or someone else locked it for you.
The Locked mode is cancelled by rotating the switch fully on and off (from Off to Overdrive to Off) within a short period. The switch will then operate normally.
SOS Emergency Signal
The light can automatically send the international SOS distress signal. This allows you to attend to other emergency tasks while sending your distress signal.
You make the light enter the SOS signaling mode by rotating the switch fully on and off and fully on again (from Off to Overdrive to Off to Overdrive) within a short period. The light will start flashing the SOS distress signal.
While in SOS signaling mode, you may use the switch to control the brightness setting of the signal. The Overdrive brightness setting operates without restriction in SOS signaling mode.
To cancel SOS signaling mode, turn the light off.
About the Battery Compartment
The battery is housed in the round part of the Action Light. The multisided battery cap unscrews counter clock-wise to provide access to the battery compartment. The battery cap is sealed using an O-ring. We recommend cleanliness when opening the battery compartment to minimize the entry of dirt, mud and water.
Changing the Battery
 Unscrew the battery cap and remove it. Carefully lift and unfold the negative battery contact until it no longer obstructs the battery compartment. You should avoid touching the gold contact screen or otherwise getting it dirty. The battery should easily slide out when the battery compartment is inverted.
Replace the old battery with a new "D" PTC-protected lithium/sulfur dioxide battery (SAFT 37260146 or equivalent). Do not use any other kind of battery in this lamp.
Insert the new battery positive end first into the battery compartment. The positive end is marked with a plus symbol, has the small button and is at the top when you are reading the label. The small button of the positive end fits into the small hole in the positive battery contact.
Carefully refold and lower the negative battery contact over the negative end of the battery. The contact matches the battery's shape. Make sure the ribbon wire is neatly seated between the two nipples on the negative contact and that the two nipples are seated in the slot.
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Screw the battery cap back on. Make sure the threads are properly aligned so as not to damage them. The battery cap should screw down easily and fit flush with no gap.