Full-size, ionization, battery-operated smoke alarm is designed to protect you & your family from the dangers of smoke & fire. Smoke alarm is easy to install. No wiring is required. Alarm is powered by a 9-volt battery, providing continuous protection even during power outages. Quality design includes a test button to verify the unit's electronic circuitry, horn & battery function are working properly. Flashing red LED indicates the alarm is receiving power. Low-battery indicator chirps when battery needs replacement. Tamper-resistant feature helps deter theft or tampering. UL listed.