Sony Ericsson K750 to 3.5mm Audio Adapter, 3.5mm Stereo Headset and Quick Transfer USB Data Cable Combo for Sony Ericsson W760a, TM506, W350, W350i, W350a, Z750A, W300i, Z520, W800, W550i, K750, W810i, W580i, W760 Premium 3.5mm audio adapter. Adapter lets you plug in any 3.5mm headset. 3.5mm Stereo headset included.