Major Features:

• Compact Size – 3 7/8" diameter
• Test Button – Tests unit's electronic circuitry, horn, and battery function
• Low Battery Indicator – Smoke alarm will chirp in the event of a low battery
• Red LED – Flashes every 30-40 seconds to indicate that the smoke alarm is receiving power
• Battery Operated (9V battery included) – Protects even during power outages
• Ionization Sensor – Protects best on fast flaming fires