Sennheiser HD660S Wired Headphones vs Sennheiser MM550X Wireless Headphones comparison

Show Only Differences Highlight Differences	Sennheiser HD660S Wired Headphones	Sennheiser MM550X Wireless Headphones
key specs
Colour	Black	Black
Headphone Type	Over-Ear	On-Ear
Connectivity	Wired	Wireless
Type	Headphones	Headphones
Microphone	-	Yes
general
Brand	Sennheiser	Sennheiser
Model	HD660S Wired Headphones	MM550X Wireless Headphones
Release date	November 10, 2017	April 2, 2012
Colour	Black	Black
Type	Headphones	Headphones
Headphone Type	Over-Ear	On-Ear
Connectivity	Wired	Wireless
Model Number	HD660S	MM550X
product details
Cord Length (Metres)	3	-
Connector Size	6.5mm	-
Weight (g)	260.00	-
Microphone	-	Yes
sound features
Sensitivity (dB)	104	-
Frequency Response Range	9Hz-41,500Hz	-
connectivity features
Bluetooth	No	Yes

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