Canon PowerShot SX400 IS Black Manual (en)

Disabling Eye-Fi Transfer
Configure the setting as follows to disable Eye-Fi transfer by the 
card, if necessary.
Press the [
] button, 
choose [Eye-Fi Settings] on the 
] tab, and then press the [
Choose [Eye-Fi trans.], and then 
choose [Disable].
[Eye-Fi Settings] is not shown unless an Eye-Fi card is in the 
camera with its write-protect tab in the unlocked position. For this 
reason, you cannot change settings for an inserted Eye-Fi card if 
the write-protect tab is in the locked position.