1、No need to install, just plug it in and use it. °C/°F can be switched freely. 2、The design is very simple and does not require too many settings. It is very convenient for children and the elderly to control your home temperature at home, just set your target temperature. 3、You can easily calibrate the temperature of the device and set the hysteresis temperature. 4、The LCD screen with green backlight displays the current temperature, target temperature, clock/heating program, and provides a clear view even in dark environments. 5、Hold down the SET button and press the RESET button to easily delete all settings and return to the factory settings. 6、With child lock function, press and hold the LOCK button for 2 seconds to lock the device. It can also be used to control heating or cooling equipment. Item Type: Temperature Controller Model: TS-3000 Material: ABS Color: White Temperature Range: 0~60°C / 32~140°F Temperature Accuracy: ±1°C /±2°F Current Temperature Resolution: 1°C /°F Target Temperature Resolution: 1°C /2°F Battery Type: 2x1.5V LR44 button battery (battery not included) How to Use: 1. Insert 2 LR44 button batteries. 3. By default, it is in heating mode and the flame symbol is displayed. If you need to switch to the cooling mode, press and hold the "HEAT/COOL" button for 2 seconds to switch to the cooling mode, and the LCD will display the snowflake symbol. 4. Select the desired TA (target) temperature by pressing the -/+ button. 6. Press the SET button to set the temperature calibration and hysteresis temperature. If you feel that the current temperature is not accurate, you can calibrate the CU (current) temperature. 7. Press and hold the LOCK button for 2 seconds, the L-symbol will be displayed on the lower left corner of the LCD, the child lock has been activated, other keys do not work, please press for another 2 seconds to cancel the child lock, L- disappears. 8. Press the ON/OFF button once to turn off the temperature control function of this thermostatic socket, and only display CU (current temperature). 1 x Smart Socket (Battery Not Included) 1 x Manual