how do I know if my laserjet 110V or 220V? it lists both on supply page

This is referring to the voltage of the unit. If you're using a standard 3 prong plug in the USA, its 110v.

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Fuser Kit
Model #: CE246A
Single Kit
Compatible with: HP LaserJet CP4025dn, CP4025n, CP4525dn, CP4525xh, M651dn, M651n, M651xh, CM4540, CM4540f, CM4540fskm, M680z, M680dn, M680f Series

Overview

Specs

Reviews (1)

HP Color LaserJet CE246A 110V Fuser Kit (CE246A)

Details
Product Sort	Printer Accessories
Product Type	Fuser Kit
Color	Black
Compatibility	HP LaserJet Printers: CP4025, CP4525
Specifications	Print Technology: Laser Input Voltage: 110 V AC Operating humidity: 20 to 80% RH Storage humidity: 10 to 90% RH Operating temperature: 50 to 90.5° F Storage temperature: -4 to 104° F
Weight	5.8

Features
Features	Print Technology: Laser Input Voltage: 110 V AC

Manufacturer Warranty
Parts	1 year limited
Labor	1 year limited

Additional Information
First Listed on Newegg	October 12, 2010