Canon Speedlite Transmitter ST-E2 Instruction manual - Page 5

2. Readying the ST-E2 ( I ) Installing the Battery About the battery If the battery contacts are soiled, improper electrical contact may result. Before installing the battery, wipe the battery contacts with a clean cloth. (2) Attachment to the Camera Use one lithium 2CR5 battery (sold separately). 1 Slide the battery compartment cover as shown by the arrow and remove. When to replace the battery Replace the battery if it takes 30 sec. or longer for the red pilot lamp to light after you set the main switch to < I > or < HOLD >. Install the battery in the orientation shown in the compart- ment. Install the battery compartment cover to close the battery compartment. 1 Push in the ST-E2's mounting foot all the way into the camera's hot shoe. Slide the shoe lock slider a s shown by the arrow. (The lock pin protrudes to lock t h e STE2 onto the camera.) To remove the ST-152,slide t h e shoe lock slider in the opposite direction ( t h e lock pin retracts) and slide off the ST-EP.