Keystone insert supports up to three phone lines.FEATURES AND BENEFITS:• Pair with a 1-Port, 2-Port, or 4-Port adorne frame for use in any adorne wall plate.• Easy "1-for-1" installation lets you simply replace your existing inserts with adorne in just minutes.• adorne fits in your existing electrical box and does not require new wires for typical installation. Innovative assembly and snap-in system make it fast and simple to install.• Easily customized with adorne wall plates available in a brilliant palette of 32 colors and a variety of luxurious materials.