Wireless Technologies 2.5mm Adapter for Samsung 2.5mm 4 Conductor for Samsung E105, X105, P107, C207, C225, S300, S307, T309, E335, D357, D407, D410, D415, X426, X427, X475, X495, X497, X507, E715 Convert any standard, non-amplified, 2.5 mm jack, 2 ring, 3 connector, hands free headset for use with your cell phone Can be used with a Bluetooth wireless hands-free 2.5mm adapter This is the 2.5 mm audio jack adapter piece only, and not the hands free headset. Important: Not compatible with microphone volume adjustment, or a Microphone Mute feature. Compatible with Samsung E105, X105, P107, C207, C225, S300, S307, T309, E335, D357, D407, D410, D415, X426, X427, X475, X495, X497, X507, E715