Klipsch X12i In-Ear Headphones KG-926 Full Range Balanced Armature Driver Featherweight (15 grams). Three-Button Remote + Mic Milled Aluminum Chassis. Connectivity technology : Wired Patented Oval Ear Tips (4 Different Sizes) Frequency response is 5 hz to 19 khz. Sensitivity is 110 db. Impedance is 50 ohms. Noise isolation is minus 26 db