NOKIA AD-50 Headset adapter - Nokia 2.5mm Male to 3.5mm Audio Adapter This Nokia AD-50 Stereo hands-free audio adapter takes you even further by giving you a means to plug-in your own Stereo Headset using a stereo 3.5 mm (1/8 inch) jack Nokia AD-50 Stereo hands-free audio adapter is the 2.5 mm male plug to 3.5 mm (1/8 inch) audio jack adapter piece only, and not the Stereo hands-free headset. Simply plug this audio adapter into your Nokia 1606, 1650, 1661, 1680, 2610, 2630, 2660, 2680, 2760, 3555, 5200, 5220, 5300 Xpress Music, 5600, 6300, 6263, 6555, 7610 Supernova and E90 cellular phone model, to convert the audio for use with any Stereo 3.5 mm (1/8 inch) plug audio device. Adjust the audio directly from the cellular phone. Not compatible with Stereo headsets that independently adjust the volume. NOT compatible with all 2.5mm Headset Phone Models