Switch the modes between cool and heat; Control temperature by setting the temperature setting value and the difference value; Temperature calibration; Refrigerating control output delay protection; Alarm when temperature exceeds temperature limit or when sensor error. Specification and size Front panel size:75(L)x34.5(W)(mm) Mounting size:71(L)x29(W)mm; sensor length:2m (include the probe) Product size75(L)x34.5(W)x85(D)mm; Technical Parameters Temperature measuring range:-50~99Celsius; Resolution:0.1Celsius; Accuracy:+/- 1Celsius (-50~70Celsius); Sensor error delay:1 minute Power supply:220VAC+/- 10%,50/60Hz; Power consumption:less than equal 3W; Sensor:NTC sensor (1PC); Relay contact capacity:Cool 10A/250VAC;Heat 10A/250VAC; mbient temperature:0~60Celsius; Storage temperature:-30~75Celsius; Relative humidity:20%~85% (No condensate). Material: ABS Package included: 4 x Mini Digital Temperature Controller Thermostat 4 x Temperature sensor probe with 2M cable 4 x Instruction Manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.