Wi Digital Systems Wi-AudioStream User Guide - Manual (Page 12)

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Sleep: The Sleep function button on the transmitter is designed to prolong the battery
life operation of the transmitter by 50% as well as the receiver battery
life by 35% when not in use. When the Sleep function on the transmitter is
activated, the transmitter sends a signal to the linked receiver to go into a
standby mode while switching to full sleep mode. The Sleep mode preserves
the audio level settings on both units as well as the communications link
between the transmitter and the linked receiver.
Press and hold the Sleep button for 2 seconds to switch the transmitter and
the receiver into standby power save mode.
Press the Sleep button once to wake-up the transmitter and the receiver.
TRANSMITTER FEATURES
Wi AudioStream
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