1. Multi-control modes among refrigeration,defrost and fan. 2. Differential control mode, and the resolution of temperature display is 0.1. 3. Multi-protection and alarm modes. 4. Digital display: Three-dig it LED andMinus digitandStatus indicator light(set refrigeration defrost fan). 5. User menu and administrator menu can be set separately. Not only convenient for user operation, but also left enough space for the adjustment of high-level management. Model number: STC-9200 Measure 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 or 60Hz 12Vac or dc, 24Vac or dc Power consumption: Less than 5W Output types: Three mechanical relays Input types: Two NTC Panel size: 75x34.5 mm External dimensions: 75x34.5x85 mm Perforation dimensions: 71 10x29 10 mm Control : ON or OFF Control Setting : Touch switch Front panel IP Rating: IP65 Operating temperature: 0 to 55 C (32 to 131 F) Operating humidity: 20 percent to 85 percent RH, non-condensing Storage temperature: -25 to 75 C (-13 to 167 F) Alias name: STC-9200 freezer temperature controller, defrost thermostat, freezer thermostat :Temperature Controller Display Type:DIGITAL Usage:Household Power Type:Charger Style:Standing Station color:Black Material:plastic Package Contents: 1 x STC-9200 Digital Temperature controller Only the above package content, other 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.