1.CLEAN,LOWER TOXICITY,SAFETY SYSTEM. 2.EASY ... QUALITY This System Including 3 PARTS:PART 1:FIRE ALARM & DETECTING,SMOKE DETECTOR,HEAT DECTOR,PHOTOELECTRIC ... SMOKE DETECTOR,FIRE CONTROL PANEL,FIRE KEEP OUT LIGHT,DANGER WARNING LIGHT.PART 2 ... THIS DECIDE THE DESIGNED CONCENTRATION )c.DO YOU NEED FIRE ALARM PART 1 LIKE SMOKE DETECTOR,...CONTROL PANEL,/......3 ...