Features 1. This digital dual relay thermostat made of ABS heavy-duty and anti-flamming plastic shell, designed with compressor delay protection, alarm when temperature exceeds temperature limit. 2. Auto converts cooling and heating modes to keep your equipments in an ideal temperature range. 3. The temperature sensor, temperature control range from -50 to 99, accuracy:1 4. Mode: Automatic switch between cooling and heating modes, Fahrenheit and Celsius display can be choose. 5. Calibration: Temperature calibrating, refrigerating control output delay protection. Specification Material: ABS Color: Black Size: 7 x 3 x 9 cm Weight: 115 g Voltage: 110-220 V Measurement range: - 50 ~ 99 Accuracy: + / - 1 (- 50 ~ 70 Resolution: 0.1 Power: