[UL Listed] VCE 12-Pack CAT6 Keystone Coupler,RJ45 Female to Female Insert Coupler, UTP Keystone Inline Coupler(Blue+Red+Yellow) Double female cat6 keystone can be used with Cat.6, Cat5, CAT5e 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. With UL Listed, just use it without concern