DIGITAL DISPLAY: The digital display provides accurate temperature readings, making it easy to monitor and switch between cool and heat modes. Set the temperature value and differential value. Features temperature calibration, refrigerating control output delay protection, and alarm functions for temperature exceedance, temperature limits, or sensor errors. VERSATILE USAGE: This thermometer hygrometer is suitable for household and office environments. Features: High quality; Mini and lightweight design; Large and clear LCD display. Automatically switches between cooling and heating modes to maintain an ideal temperature range. Equipped with 2 relays. Supports Celsius temperature display. Wide temperature range: -50°C to 99°C. Dual heating and cooling function. Compressor delay protection for refrigerating control. Control temperature by setting the set value and differential value. Technical Parameters: 1. Temperature measuring range: -50°C to 99°C 2. Resolution: 0.1°C 3. Accuracy: ±1°C (-50°C to 70°C) 4. Sensor error detection delay: 1 minute 5. Power supply: 110–220V AC, 50/60Hz; 12V DC; 24V DC (selectable at order) 6. Power consumption: Low power consumption design