Audiovox APS-94FR - Manual (Page 4)

The transmitter incorporates a small red L.E.D. built into the case. This L.E.D. can
be used to indicate battery condition. You will notice a decrease in transmitter range
as the battery condition deteriorates. To replace the battery...
1. Remove the transmitter cover by removing the small screw from the back of the
transmitter case.
2. Remove the discharged battery, making note of the orientation of the + and -
contacts, and dispose of properly.
3. Install the new (type GP23A) battery, taking care to orient the + and - contacts
properly.
4. Replace the transmitter cover, taking care not to damage the L.E.D. or switches
on the circuit board.
BATTERY REPLACEMENT: