Dell 1420X Projector - Manual (Page 24)

Installing the Remote Control Batteries
NOTE: Remove the batteries from the remote control when not in use.
1 Push and hold the locking arm while pulling out the
battery holder.
2 Check the polarity (+/-) marking on the battery.
3 Insert the battery and align their polarity correctly
according to the marking in the battery compartment.
4 Push the battery holder back.
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Using Your Projector 24