Description: 1. This product is an upgraded version of W3230 temperature control. 2. Compared with the previous generation, the upgrade is as follows 1 degree Celsius (°C) and Fahrenheit (°F) can be measured and displayed (W3230 can only display measurement °C) 2 increase the buzzer (Buzzer), can send an audible buzzer alarm (W3230 no buzzer) 3 red and blue bi-color indicator light indicates the output mode at the same time, red is the heating mode (heat), blue is the cooling mode (Cool) (W3230 is a single red indicator, only the output can be indicated) Features: Temperature control range: -55℃~120℃/-67℉~ 248℉ Temperature control accuracy: 0.1 °C / 0.1 °F Display color: red + blue Working power supply: AC 110-220V Sensor: NTC 10K 1 Meter (with probe) Product Size: 79.2mm×41.9mm×26.3mm Hole Size: 72.1mm×39.2mm product weight: 52g Operation guide 1. Short press “SET” small digital tube to flash, press “up” or “down” to set the target temperature, press “Standby” button or no operation to save the setting within 3 seconds. 2. Press and hold “SET” to enter the code setting mode, press “up” or “Down” to switch the code. After selecting, press “SET” to enter the code setting. After setting, press “Standby” button or no operation to save the setting within 3 seconds. . 3. The last parameter setting is saved by default after shutdown. 4, restore the factory settings: press and hold "SET" to power on. 5. When the module is powered on, it will start directly. After power-on, press and hold the “standby” button, the module will enter “sleep” or “wake up”; in case of power failure, the module will run automatically after power recovery, no need to start manually. **The working power supply voltage must be connected according to the standard voltage of the label, otherwise the module will be damaged easily.