This Creality filament sensor kit is suitable for the following models of Creality printers: CR-200B, CR-30 (PrintMill), CR-6 SE, CR-10 Smart, CR-10 Smart Pro, CR-6 Max and the Ender- 7. When the filament runs out, a red LED lights up on the sensor. As soon as the sensor detects filament again, the LED lights up blue.