Etymotic Research ETY-COM ER22-C Noise-Isolating Mobile Phone Headset - Retail Packaging - Black High-fidelity earphone provides noticeably better sound quality than ordinary headsets Frequency response extends beyond the typical low-fidelity telephone bandwidth For use with mobile phones and cordless phones Highest noise isolation and noise rejection of all headset microphones Purchase includes headset, 4 foot cord, assorted ear tips, replacement filter, filter changing tool, shirt clip, case, 2 windscreens and VoIP adapter