Smoke Alarm, Battery Chemistry Alkaline, Battery Location Back, Battery Locking Pin Yes, Battery Size 9V, Communication Protocol Wireless, Compatible With Not Applicable, Detector Type Smoke Detector, Features Quick Connect Power Harness, Includes 9V Battery, Number of Tandem Detectors Not Applicable, Power Source Removable Battery, Sensor Type Photoelectric, Visual Alert Type Red LED, Volume Level 85 dB @ 10 ft, Alarm Setting 30 ppm, Battery Backup No