2.5mm Female to 3.5mm Male Headset Adaptor for Apple iPad/iPad 2/iPhone/3G/ 3Gs/4/4 CDMA/HTC and Other Phone Models (This will allow you to use your 2.5mm headset with a device that has 3.5mm) Compact and portable Lightweight 2.5mm Female to 3.5mm Male Headset Adaptor for Apple iPad/iPad 2/iPhone/3G/ 3Gs/4/4 CDMA/HTC and Other Phone Models