Canon SPEEDLITE EL-10 Advanced User's Manual page 98

2.
Set up a unit as the receiver.
Set the EL-10 for wireless control by the sender as the receiver (
You can also use other Speedlites equipped with radio transmission
wireless receiver functionality.
3.
Check the channel and ID.
Set the same transmission channel and wireless radio ID on senders
and receivers, if they are different (
4.
Position the camera and other Speedlite.
Position them within the range shown in
5.
Press the < > button on the sender <
98
).
Positioning and Range.
> cross keys.
).