Coby CA757 Nokia Earphone Microphone Adapter for 5100 & 6100 Series 

• Adapter compatible with Nokia 5100 and 6100 series cellular telephones
• Allows you to change your cellular telephone to hands free operation
• Compatible with all headphone/microphone combination products with a 2.5mm adapter plug
• Recommended to use with Coby models: CV-M15, CV-M20, CV-M25