Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 466)

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Connecting to a Wireless Remote Control
Canceling the Pairing
Before pairing with a diff erent BR-E1, clear the information about the
connected remote control.
1 Select [ k : Wi-Fi/Bluetooth
connection].
2 Select [ K Connect to Wireless
Remote].
3 Select [Delete connection
information].
4 Select [OK].