... phone Advantagesno have interference,very clear and steady voice ,one camera can connect more monitors,also more cameras can ... to choose this productBecause our video doorphone is handfree one,convenient to use,Cable for connection ,voice will be ... distance 50m/165feet(22AWG,0.65mm4wire) Package listOne piece Indoor phone ,One piece outdoor phoneOne Indoor phone wall mounting bracketUser manualSome ...