Canon EOS Rebel T5i (no lens included) Owner's Manual

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Using Eye-Fi Cards
Cautions for Using Eye-Fi Cards
 
If “J” is displayed, an error occurred while retrieving the card 
information. Turn  he camera’s power switch off and on again.
 
Even if [Eye-Fi trans.] is set to [Disable], it may still transmit a signal. In 
hospitals, airports, and other places where wireless transmissions are 
prohibited, remove the Eye-Fi card from the camera.
 
If the image transfer does not function, check the Eye-Fi card and 
personal computer settings. For details, refer to the card’s instruction 
manual.
 
Depending on the wireless LAN’s connection conditions, the image 
transfer may take longer or it may be interrupted.
 
Because of the transmission function, the Eye-Fi card may become hot.
 
The battery power will be consumed faster.
 
During  he image transfer, auto power off will not take effect.