2.5mm Male to 3.5mm Female Stereo Audio Jack Adaptor 2.5 mm Male to 3.5 mm Female Use 3.5 mm Headphone on 2.5 mm device Stereo Sound Compatible with: BlackBerry By RIM, Cal-Comp, Casio, Huawei, Kyocera, LG, Motorola, Nokia, Samsung, Sanyo