3.5mm Headphone Adapter is the must-have item for all iPhone (1st generation) users. Lets you connect your favorite headphones into the recessed headphone jack on your iPhone. Integrated microphone with volume control lets you talk on the phone using your favorite headphones. One-touch button lets you play/pause or music or end phone calls. If you receive a call while listening to music, your music continues when the call is ended. Compatible with any 3.5mm headphone, earphone, headset or external speakers. Suitable for Apple iPhone or any digital audio device with a 3.5mm headphone jack. Adapter cable measures approximately 30 inches long