... , fire security products) 1. Up to 40 Heat And/Or Smoke Alarms AC/DC Powered Heat Alarm (heat detector, fire security products ... )1. Sensitive only to a fixed temperature2. Less nuisance alarms due to contamination, dust and insects3. With quick fix mounting ... . Self-test button9. Interconnectable (Up to 40 Heat And/Or Smoke Alarms)10. CE, FCC approved, comply with EN54, EN50130-4,UL521 ...