Specification - 18 Guage 7 Conductor wire, 16.4ft, Maximum voltage 300V, Maximum current 7.5A, Outer diameter 8.1mm. Using Tinned Copper is an easy and effective way of preventing a copper conductor from tarnishing or becoming oxidized Safety - The insulation is made of high quality PVC rubber, and the cable opeating rated temperature is -40~+80. Our extension wire is safe for daily use Insulation: PVC or Polypropylene insulation, color-coded for thermostat cable Jacket: Outer jacket of polyvinyl chloride (PVC), which is heat,moisture and sunlight resistant Applications: Thermostat ControlHeating and A/C installationsTouch-plate systemsBurglar alarmsIntercomsDoor bellsAnnunciator systemsRemote controlsSignal systemsLow-voltage installations. models, lamps, lighting fixtures, household appliances, and more. PVC wire are widely used for most low voltage cases