This is Altronics catalogue number K8120.
General purpose low-cost thermostat soldering kit with NTC temperature sensor. Output relay with LED-indicator.
Automotive applications (fan control)
Temperature regulated fan control (on/off)
Preset temperature alarm
Temperature range: +5°C to +30°C approx.
Relay power rating: 24V DC/AC 3A
Power supply: 12V DC / 100mA
Dimensions: 54 x 62 x 28mm