Canon S400 Reference Manual page 254

Storage environment:
Temperature: 0°C to 35°C (32°F to 95°F)
Humidity: 5% to 90% (no condensation)
Power supply:
Europe AC 230V±10%, 50Hz
USA/Canada AC 120V, 60Hz
Australia AC 240V, 50Hz
Power consumption:
off*: Approx. 1W (AC 230±10%)
Approx. 1W (AC 120V)
Standby**: Approx. 2W (AC 230±10%)
Approx. 2W (AC 120V)
Printing: Approx. 30 W
* To shut down power completely, remove the power cord from the wall
outlet.
** This printer is provided with an automatic power off feature. If the
printer does not receive any data for a specified length of time, the
printer automatically powers down to the standby mode. You can set
the printer to power down automatically if it does not receive a print
job for 1, 10, 30 or 60 minutes.
For details about switching on the Auto Power Off feature and setting
the time interval to elapse before powering down to standby, refer to
on-line Help.
Specifications 254