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 ...

2.5MM PHONE HEADSET & 2 Year Warranty : Plug and play. Easily with Panasonic AT&T Uniden Cisco SPA Grandstream Polycom Home Office Landline Phones and most Cordless Dect Phones with standard 2.5MM ...