This Stereo Headset adapter allows private stereo music on any 3.5mm headset. Features a 3.5mm Male Jack to a 3.5mm Female Socket, allowing you to use compatible 3.5mm headset/earphone with your Apple iPhone's recessed jack as well as any 3.5mm equipped device. Compatible models include but not limited to: Apple iPhone 4 / Apple iPhone 4S Type: Cable Compatible Phone Manufacturer: Apple iPhone 4 / Apple iPhone 4S