**********Double female cat6 keystone can be used with Cat6, Cat5e, Cat5 Ethernet cables*****CAT6 Keystone inline Coupler for voice, home networking, home office, audio, video and more*****Fits all standard keystone wall plates and panels*****Gold plated contacts and easy snap-in retaining clip ensure a secure and corrosion free connection*****Warranty: One Year Warranty for quality problem.