Plantronics M40S Stereo Mobile Headset for Most Phones with Standard 2.5mm Headset Jack, MP3 Players, and Other Personal Audio Devices (Discontinued by Manufacturer) Effortless Calls: In-ear style for quick simple fit. Multi-Use Convenience: Works with your mobile phone, portable music player, or laptop. Discreet Design: Compact earbud and microphone-on-cable easily fit into your pocket. Clear Conversations: Make clear calls with omni-directional microphone. Excellent volume for easy listening