RS-247 CHAMP  Wired Earphones with mic call answer/call SUPER BASS SOUND & balanced sound-compatible with almost all mobiles phones, music players, portable gaming devices, and computer. the Earphones has a sensitivity range of 1.15+3db. RS-247 CHAMP  Wired Earphones/ Handsfree provides awesome sound quality and noise isolation. Connectivity details through connector-3.5mm audio jack frequency responce-20hz-20khz 10-driver unit-010mm.