This ionization Kidde, KID440374, Fire Smoke Alarm, 1, White is designed to protect you and your family from the dangers of smoke and fire. It's easy to install, as no wiring is required, and it's powered by a 9V battery that is included, for continuous protection even during power outages. The quality design of this tamper-resistant smoke alarm includes a test button to verify the unit's electronic circuitry, horn and battery function are working properly. A flashing red LED indicates that the alarm is receiving power, and a low-battery indicator chirps when the battery needs replacement. This Kidde, KID440374, Fire Smoke Alarm, 1, White has a tamper-resistant feature that helps deter theft or tampering so you can rest assured that it will continue to function properly. This product is UL listed for your safety and peace of mind.