Canon SPEEDLITE EL-1 Advanced User's Manual page 113

Setting the Transmission Channel / Wireless Radio ID
Use the following procedure to set the transmission channel and wireless radio ID of the
sender unit. Set the same channel and ID for both the sender unit and receiver unit. For
details on the receiver operation procedure, refer to the Instruction Manual of the Speedlite
equipped with the radio transmission wireless receiver function.
Caution
When establishing multiple radio transmission wireless flash systems in a place,
interference between flash systems may occur even if the flashes are set to
different transmission channels. Set different wireless radio IDs for each channel.
1.
Push the joystick vertically.
2.
Select Item (1).
Push the joystick up / down / left / right, or turn <
channel item, then push the joystick vertically.
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