Functions: Refrigerate. Compelled refrigerate . Rectify temperature. Alarming of sensing tip failure . Alarm and cancel alarming in case of exceeding temperature Parameters: Power supply: 220VAC±10%(or 380VAC±10%),50HZ Outputs: <3VA Measuring range: -40°C∽+50°C Distinguishing rate: 0.1°C Precise: ±1°C Exceeding temperature alarming adjustable range: 0°C∽20°C Temperature adjustable range: ±5°C Compressor switch-on delayed protect time: adjustable in 0∽9minutes Compressor output: 5A/240VAC Alarming output: buzz + LED blinking Input: NTC probes Operating temperature: -5°C∽+55°C Stored temperature: -10°C∽+65°C Relative humidity: 20%∽95%(NOT Frost) Recommended installing hole size: 32mm(height) ?72mm(length) ?85mm(depth) ±1mm