Only the best-quality components are used when StarTech.com’s expert manufacturing team creates our cabling and this cable is no different. Our RJ11 4-pin Phone Line Coupler F/F will let you connect 2 RJ11 cables together so you can increase your effective cable lengths. Backed with a lifetime warranty, these cables help StarTech.com maintain our tradition of offering top-notch parts and products for the best price possible.