Canon SPEEDLITE EL-1 Advanced User's Manual page 127

7.
Check transmission status and charging.
Check that the < > lamp is lit in green.
When the receiver flash is ready, the AF-assist beam emitter blinks at
approx. 1-second intervals.
When the sender unit is set to P.Fn-06-0 ( ), the sender unit's beep
will sound when recharging of all flash units is completed.
Check that the < > icon (1) is lit on the sender / receiver unit's LCD
panel (< > is not displayed).
For details of the LCD panel illumination of the sender, refer to About
the LCD Panel Illumination.
Check that the sender unit's flash-ready lamp is lit.
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