Uniden PRO 640XL Owner's Manual page 5

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R1. ANTENNA CONNECTOR
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This female connector permits connection of
the transmission line cable male connector (Pl-259J to the transceiver.
R2. PUBLICADDRESS - An external 4 ohm 7-watt speaker must be connected
to the "PASP"jack located on the back of the unit. The speaker must be directed
away from the mic to prevent feedback.
R3. EXTERNAL SPEAKER - The "EXT.SP." jack is used for remote monitoring.
The external speaker should have a 4 ohm impedance and be rated at least 7
watts. When an external speaker is connected, the internal speaker is disabled.
R4. POWERCONNECTOR -
This connector allows you to connect the power to the PRO 640XL
with the power connecting cable.
Pro 640XL Rear Panel