Hello NANCY, the WML75011HZ is a higher end model, it features a Scrolling Electronic Display Sensor Cooking capability, CleanRelease® Non-Stick Interior, Steam Cooking, Fingerprint Resistant Stainless Steel, LED Cooktop lighting vs Halogen on the 550 model. These features are in addition to the greater choice in Fan Speed. The other features are the same for the two units like finished sides and 1000 Watt cooking power. Hope this helps!
6 years, 4 months ago
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WhirlpoolTeam