Canon A2100 IS - Manual (Page 114)

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If you use AC Adapter Kit ACK800 (sold separately), you can use the
camera without worrying about how much charge is left in the batteries.
Turn off the camera.
Plug the cord into the camera.
● Open the cover and fully insert the
adapter plug into the camera.
Connect the power cord.
● Connect the power cord to the compact
power adapter, then plug the other end
into a power outlet.
● You can turn the camera on to use it.
● After you finish, turn off the camera and
unplug the power cord from the power
outlet.
Using Household Power
Do not unplug the power cord or adapter plug with the camera turned on.
This could erase images you have taken or damage the camera.