IP2731P Features Superb sound quality Foldable headset Built-in microphone Answer key for added convenience General Specs Brand Kanen Model IP-850 Sound Excellent super bass stereo sound Earphone Type Wired headset Impedance  32(+/-15%)ohms Sensitivity 105db(+/-3db) Frequency Response 20-20KHz Connector 3.5 mm audio jack Cable Length 1.2 m Dirver 40 mm Compatibility iPhone， iPod， iPad， MP3 player， mobile phones Package Details Weight: 276.06 g Size: 20.5*18.5*4.7 cm Package Includes * Headphone