Adapter Converter RJ9/RJ10/RJ12 4P4C Headset/Handset Plug to Mobile Smart Phone Headset Headphone 3.5MM Plug Convert 4P4C RJ9/RJ10 headset/handset plug To iPhone/iPod Headset 3.5mm Plug All functions on headset and phone would function same Easy Setup, Plug and Play. Please read compatible phone list in description Premium Quality , 1FT Long Cable Notice : please see compatible phone list in description, NOT compatible with Cisco Phone