-Open movable circle earplug: -Particular technique of XCANNE -Particular XBASS strengthen technique, bass is surge and euphonious; -Particular technique of ultra-thin 5U high speed loop respond; -Particular atmosphere kinetics tune design; -DC plug which can pull in and out over 2000 times and still nondiscolouring; -The cable can pass the tensile resistance test over 8 KG; -be applicable to MP3, MP4 and so on. -frequency <app:ds:frequency> answer: 20HZ-20KHZ; -The plug pass the sway test for 2500 times; -Rated <app:ds:power%20rating> input power: 5MW. -left and right degree of balance: 3dB at1KHZ. -resistance <app:ds:resistance>: 32 O -Distortion: 3%1KHZ..