The product is a two-stage controller that can simultaneously and cool using two different sides of a standard electrical relay. In the heating mode, when the is lower than the set , the controller is turned on and turned off when it is higher than the set . In the cooling mode, the is turned on when the is higher than the set , and is turned off when the is lower than the set . The product can switch between Celsius and Fahrenheit. Features - Color: Black and orange. - Material: Plastic. - Size: 8.50 x 7.50 x 3.50cm/ 3.34 x 2.95 x 1.38 inch. - control: - 50 degree centigrade ~ 110 degree centigrade. - Power supply voltage: AC220V, AC110V. - Switch the modes cool and , control by setting the set value and the different value. - calibration, refrigeration control output delay protection,alarm when exceeds limit or when error. - High , with better support and better service. Waterproof and not rust. - With the compensation function, which effectively avoids the influence of the ambient on the , making the measurement is more precision. - Applied to the measurement of boilers, air, liquids, water in the fish pond, water of the baby bath, Industrial measurement. Package list: 1 x refrigerator thermostat