From the Manufacturer:
UL-listed high quality product for safe assurance in operation, thermal switch included, cut off power automatically when overheat. Air tight design + durable galvanized metal IC housing, prevent heated airflow diffusion, and can be directly connected with thermal insulation and combustible materials. Compatible with standard 4-inch LED down light with TP24 connector. Standard 4 inch remodel recessed housing. For your convenience, a cut-out size guide template sticker is included in package.