Tekmar tN4 User Switch - Three INPUTS. tekmarNet??4 User Switch 480 is a simple 3 button switch that provides an easy way to override system temperatures. With push of a button, one can put all rmostats and boiler controls into an unoccupied" or away" state and take advantage of saving energy when building is not being used. buttons on this product are also programmable, allowing user to experience scenes within ir system. 480 has three demand inputs that can provide access to tekmarNet??4 scenes or setpoint devices from a telephone switch, home automation, or security systems.