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This handsfree is compatible with the following Sony Ericsson models: K500i, K700i. P800, P900, P910a. S700i, S710a. T60, T60d, T60lx, T61lx, T61d, T61z. T68, T68i. T200, T226, T237, T290a. T300, T306, T310, T316. T608, T610, T616, T630, T637. Z200, Z500a, Z600. Features: Consists of a retractable earphone and microphone system. Comes with on/off switch beside earpiece that allows you to answer a call without having to reach your cell phone. Retractable cord to prevent it from tangling up. Super clear sound quality.