W1209 Acrylic Shell. 1PCS Acrylic Box( without W1209 module ). W1209 Thermostat. W1209 Thermostat+Case. Refresh rate: 0.5S. LED: Shows LL is the sensor open, showing ?. HH is out of range, the thermostat will be forced to close the relay, the display --- as high temperature protection.
eBay