Uni-Art Precise SP4790 User Manual page 6

Having finished the above simple wiring, Signal LED glows when the transmitter detects audio input
signal played from the source.
SPEAKER RECEIVERS
1. Remove the door of the battery compartment.
2.
Insert 6 pieces of 'AA' size ALKALINE batteries (not included) into the battery compartment with
correct polarity under the speakers, then replace the door of battery compartment, or connect
the provided AC/DC 9V Adaptor to the DC input jack under the speakers, then plug it to the wall
AC outlet.