A set that comes with a thermo ready to use. Electronic Thermostat: When connected to a device that exceeds the capacity, the built-in current fuse will work and cut the power supply. Eliminates the heat dissipation slit of the main body, protecting it from moisture and dust during normal use. The power cord of the main unit uses a tracking plug. The outlet that connects to the heater is made tight for reasons such as preventing leakage. Please be aware in advance that it may be difficult to plug and unplug the outlet. Not for use with heater control for ornamental fish. (Cannot be used underwater) Rated voltage: AC 100 V, 50 Hz/60 Hz; Connectable heater capacity: 310 W. *Can connect up to 3 100 W heat source (100 W thermal bulb in a large cage, please use 3 adapter to use the thermos reception outlet and increase the thermal bulb. Temperature Control Range: 59.1 - 104°F (15 - 40°C) ± 1.3 °F (1 °C); Product Size: W 2.2 inches (56 x 32 x 85 mm); Included Cord: 3.3 ft (1 m); Outlet Cord: 0.2 m; Sensor Cord: 3.3 ft (1 m); Pet Heater 40 W). Cord Length: 4.9 ft (1.5 m); Size (W x D x H): 3.9 x 3.9 x 8.3 inches (100 x 100 x 2