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Comparison features
QuietComfort® 20 Acoustic Noise Cancelling® headphones

$299.95

QuietComfort® 20i Acoustic Noise Cancelling® headphones

$299.95

IE2 audio headphones

$99.95

MIE2 mobile headset

$129.95

MIE2i mobile headset

$129.95

FreeStyle™ earbuds

$129.95

SIE2 sport headphones

$119.95

SIE2i sport headphones

$149.95

Application
Best for Noise cancelling, music and calls Noise cancelling, music and calls Music Music and calls Music and calls Music and calls Music Music and calls
Design
Ear tips StayHear®+ StayHear®+ StayHear® StayHear® StayHear® StayHear® StayHear® StayHear®
Audio
Noise cancelling technology            
TriPort® acoustic technology
Aware mode            
Communication and control
Inline remote and mic for calls and music control Optimized for select Android™, BlackBerry® and Windows® devices Optimized for iPhone® and most Apple® devices; select features compatible with today's most popular smartphones   Optimized for select Android™, BlackBerry® and Windows® devices Optimized for iPhone® and most Apple® devices; select features compatible with today's most popular smartphones Optimized for iPhone® and most Apple® devices; select features compatible with today's most popular smartphones   Optimized for iPhone® and most Apple® devices; select features compatible with today's most popular smartphones
Storage/travel
Case/bag Soft case Soft case Soft case Soft case Soft case Soft case Armband Armband
Power
Rechargeable lithium-ion battery (charger included)