The ThermoSmart heated hose has an internal heated coil and algorithms which measure temperatures from the humidifier to prevent condensation from forming. Features Product Features Long Dimensions The ThermoSmart heated hose measures 76.5 inches from end to end. The diameter of the tube is 19mm. Heating Technology The ThermoSmart heated hose has an internal heated coil which prevents condensation from building up as well as including an algorithm which measures the temperatures from the humidifier to better prevent condensation. Note: This tubing will ONLY work with the ICON Series CPAP Machines. Specifications Product Specifications Brand: Fisher & Paykel Manufacturer: Fisher & Paykel Included In Box: (1) Heated Tubing Tube Length: 76.5 in (1.94m) Tube Internal Diameter: 3/4" (19mm)