This information is taken directly from the HP Envy 4500 e-All-in-One Series web site. If you need more information, go to www.hp.com/go/support.

Power specifications
A9T80-60008 ● Input voltage: 100-240Vac (+/- 10%)
● Input frequency: 50/60 Hz (+/- 3Hz)
A9T80-60009 ● Input voltage: 200-240Vac (+/- 10%)
● Input frequency: 50/60 Hz (+/- 3Hz)
NOTE: Use only with the power adapter supplied by HP.