Model Number: HM-622PS-JAY-1 Brand Name: HEIMAN Key Specifications/Special Features: 1-Advanced photoelectric sensing technology; detects visible particles (associated with smoldering fire) sooner than ionization alarms.2- Convenienttoinstallandmaintain.3-Battery compartment on alarm top surface; battery replacement is more convenient and has protection function for reverse battery loading.4-Autocheckmalfunction.5-Low battery warning; smoke alarm will chirp once every 40s to remind user of replacing a new battery.6-Autoreset.7-Sound and flash alarm; alarm sound louder than 85 decibel with red LED flashing.8-Test button; tests unit’s electronic circuitry, buzzer and battery function.9-SMTmanufacturetechnology;highstability.10-Dustproof, mothproofandanti-whitelightinterferencedesign.11-Anti-RFI(20V/m-1GHz).