RJ45 coupler use to connecting two male ethernet cables together and extend the length of ethernet cable. Plug and play, Work perfectly. Network speeds up to 1GB. Network couplers are metallic shielded to prevent electrical interference RJ45 Coupler meets Category 6 performance, TIA/EIA 568-C.2 Verified, FCC, RoHS Compliant. 8P8C female to female ethernet coupler jack is compatible with Cat7/Cat6/Cat5e/Cat5 network cable.