Etymotic Research ER22-B2-A ETY-COM Noise-Isolating Mobile Phone Headset with 3.5mm Plug and VOIP Adapter - Wired Headsets - Frustration Free Packaging - Black High-Fidelity earphone provides noticeably better sound quality than ordinary headsets, both for hearing and BEING heard Frequency response extends beyond the typical low-fidelity telephone bandwidth For use with mobile phones and cordless phones (works with most smartphones EXCEPT iPhone 4) Highest noise isolation and noise rejection of all headset microphones Purchase includes headset, 4 foot cord with a 3.5 mm plug, assorted ear tips, replacement filter, filter changing tool, shirt clip, case, 2 windscreens and VoIP adapter