You'll occasionally need to replace the battery in your Time Timer. If the red disk has stopped moving you should check the lens cover before replacing the battery.
To replace the AA battery, please view the video below and do the following:
- Open the battery compartment on the back of your Time Timer PLUS or MOD using a small, Phillips head screwdriver.
- Insert the AA battery negative side (the flat end) first into the compartment so that it is touching the spring.
- Replace the cover to the battery compartment and tighten using the small, Phillips head screwdriver.