To install the Bosch Security D263TH smoke detector, start by selecting an appropriate location on the ceiling or wall, following local fire code regulations and manufacturer guidelines. Ensure the area is clear of obstructions and away from air vents or drafty areas. Then, using the provided mounting hardware, securely attach the base of the detector to the chosen location. Next, connect the wiring according to the wiring diagram provided in the manual, ensuring proper polarity. Once wired, carefully insert the detector into the base and twist clockwise to secure it in place. Finally, perform a functional test to verify proper operation. Remember to regularly inspect and maintain the detector according to the manufacturer’s recommendations to ensure continued reliability.