HP Deskjet 5850 Color Inkjet Printer - Manual (Page 216)

The extended warranty and product take-back options are
not available in all countries/regions.
energy consumption
Energy consumption in standby mode: See the reference guide for energy
consumption specifications.
Energy consumption in off-mode: When the printer is off, an amount of energy is
still being consumed. Energy consumption can be prevented by turning the printer
power off, then disconnecting the end of the printer power cord from the electrical
source.