Connect heater & cooler at the same timeNo more frequently change wiring between heater and cooler. This temperature regulator has 2 relays. Compared with other 1 relay temperature controllers, you can wire 2 appliances (heater and cooler) at the same time. Please kindly note no outlets, wiring needed. Keep temperaure in desired rangeIt's on/off control mode. You can program by simply setting temperature set value and difference value, heating and cooling mode can be automatically switched. Fully utilize the stc microcontroller and NTC probe to have this temperature regulator has great accuracy. High accuracyMade of ABS heavy-duty and anti-flamming plastic shell with embedded structure, this digital dual relay thermostat is safe and energy saving. Power consumption: 3W, Temperature control range: -50~99, Accuracy: 1, Power supply: 230Vac 50/60Hz, Output: 2 Relays, Cool / Heat (10A/250Vac). Multi-FunctionalThis incubator thermostat supports temperature calibration, compressor delay protection, alarm when temperature exceeds temperature limit or when sensor error, all parameters setting can be saved after restart. 2m Waterproof probeThis temperature controller 230V can be used in moisture and water environment. Such as aquarium, seafood machine, aquaculture, hatchery, terrarium, vivarium, seedling heat mat, incubator, brewing, freezer, water tanks, refrigerator, industrial chiller, fermentation, industrial equipment, ect.