Jkd-512com User Manual [extra Quality] -

Press the central "TEST" button once. The unit will cycle through its alarm patterns and display current sensor readings. LCD Display:

Install at least 10 feet (3 meters) away from fuel-burning appliances to avoid nuisance alarms. Ceiling: Mount at least 4 inches (10cm) from side walls. jkd-512com user manual

80dB audible siren with a flashing red LED light. Press the central "TEST" button once

Replace the entire unit immediately if the "End of Life" signal occurs or if it fails a manual test. jkd-512com user manual