Sennheiser CXC 700 Ear-Canal Travel Headphones with 3 Digital Noise Cancellation Settings na Imported Connectivity Technology : Wired Noise Gard digital active noise cancellation with 3 different modes Talk through function enables communication while wearing earphones Highly advanced acoustic system for excellent Audio performance Excellent passive attenuation of ambient noise of 25Db for Freq range above 3,000hz Optimised for in-flight entertainment systems as well as MP3, iPod, iPhone, iPad and portable media players; Connectivity Technology: Wired