Eclipse - Fujitsu Ten CD3404 Car Stereo System User Manual

How to use an optional NOB remote control
Be extremely careful not to swallow the battery.
The battery life is approximately one year. If the remote control
unit does not operate correctly or if the button lamp gets dim,
replace the batteries.
Be sure to orient the batteries correctly so that the positive and
negative poles match the diagram.
Do not use one new battery and one old one; use two new
Use only two of the same kind of battery.
If any liquid is seen leaking from the batteries, remove both
batteries and dispose of them properly. Thoroughly clean the
battery compartment with a dry cloth. Then install new