Single 120V AC grounded outlet. Monitors growing media temperature with a water-resistant, stainless steel probe and maintains root temperature at level selected on digital LED controller. Controllable range: 68°-108°F (20°-42°C). Celsius or Fahrenheit read-out. Compatible with all Hydrofarm heat mats and any 120V powered heat mat. Multiple mats may be connected with a power strip as long as max power ratings are not exceeded. 6' 120V power cord and 6' temperature probe cord. Max load: 8.3 amps/1000 watts.