Note：When the “Keep WLAN connection during sleep” option is disabled
(default), WiFi will automatically turn off during system sleep and reconnect
upon wakeup, significantly reducing power consumption. Enabling this option
maintains a WiFi connection during sleep with moderately higher power usage.
Bluetooth
The M21 supports lots of Bluetooth codecs for both transmission and reception,
allowing for rich wireless connections.
Bluetooth transmitting
When being a Bluetooth transmitter connecting to new Bluetooth devices (such
as Bluetooth headphones, Bluetooth speakers), the M21 needs to pair with the
Bluetooth device first. Here are the steps.
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