HP Officejet Pro 8000 - A811 - Manual (Page 73)

Power requirements
Input voltage: 100 to 240 VAC (± 10%), 50/60 Hz (± 3Hz)
Output voltage: 32 Vdc at 2000 mA
Power consumption
21 watts printing (Draft Mode)
Acoustic emission specifications (print in Draft mode, noise levels per ISO 7779)
Sound pressure (bystander position)
LpAd 54 (dBA)
Sound power
LwAd 6.7 (BA)
Printer specifications 69