This is XH W1209 digital temperature controller Module W/ Display and NTC Waterproof Temperature Sensor.
W1209 Mini thermostat Temperature controller is low-cost 12V Temperature controller with 7-segment display and 3 switch keypad for setting temperature and other parameters.
The module features an NTC thermistor temperature sensing and has an accuracy of 0.1 C.
The XH W1209 digital temperature controller Module W/ Display and NTC Waterproof Temperature Sensor is an incredibly low cost yet highly functional thermostat controller.
With this module, you can intelligently control power to most types of electrical device based on the temperature sensed by the included high accuracy NTC temperature sensor.
Although this module has an embedded microcontroller no programming knowledge is required.