2.5mm jack curly clable with Plx QD "Works with Ciso SPA Series and other Cordless phones with 2,5mm Standard Headset Port.(3 poles with 2 black bands), No Smart phone use. Works with Grandstream ...

Insignia Landline Phone Hands Free Headset Amazon on sale, MAIRDI Phone Headset with Microphone Noise Canceling with RJ9 3.5mm Jacks for Multiple Devices Office Headset for Call Center Telephone Work ...