The ts100 external temperature sensor works with the wallbotz 310 400 and rackbotz 310 400 this allows temperature monitoring for a different area of the rack andor server room for example if the netbotz appliance is high in the cabinet the external sensor can be positioned in the lower portion of the cabinet or the external sensor can be placed outside the cabinet or in an adjacent cabinet and or server room a 15 foot cord included provides flexibility for all of these alternativesa