Amazon.com: 2.5mm Jack Headset with Microphone + Volume Mute Control for Telephone Panasonic Cordless Handset Phone, Cisco Spa303 Spa504 Series, Polycom Soundpoint IP, Panasonic KX and More (Mono-2.5mm) : Electronics
2.5mm Telephone with Noise Canceling Mic for Panasonic, Including 3.5mm Connector for Cell Phone PC Laptop, - Walmart.com