1. Multi-control modes for refrigeration, defrost, and fan. 2. Differential control mode with 0.1° resolution temperature display. 3. Multiple protection and alarm functions. 4. Digital display: Three-digit LED with minus digit and status indicator lights (for refrigeration, defrost, and fan). 5. Separate user and administrator menu settings for convenient operation and advanced configuration. Model number: STC-9200 Measurement range: -50 to 90 °C Setting range: -50 to 50 °C Accuracy: ±1 °C (-40 to 50 °C), ±2 °C (50 to 70 °C) Supply voltage: 220Vac, 110Vac, 50/60Hz; 12Vac/dc, 24Vac/dc Power consumption: Less than 5W Output types: Three mechanical relays Input types: Two NTC sensors Panel size: 75x34.5 mm External dimensions: 75x34.5x85 mm Panel cutout dimensions: 71x29 mm Control method: ON/OFF Control Setting method: Touch switch Front panel IP Rating: IP65 Operating temperature: 0 to 55 °C (32 to 131 °F) Operating humidity: 20% to 85% RH, non-condensing Storage temperature: -25 to 75 °C (-13 to 167 °F) Alias: STC-9200 freezer temperature controller, defrost thermostat, freezer thermostat Theory: Temperature Controller Display Type: Digital Usage: Household Power Type: AC/DC adapter (not included) Style: Panel mount Color: Black Material: Plastic Package Contents: 1 x STC-9200 Digital Temperature Controller Note: Light shooting and different displays may cause the color of the item in the picture to slightly differ from the actual product. Measurement error allowed is +/- 1-3 cm.