Battery operated smoke alarm (9V battery included). Flashing red light indicates alarm is receiving power. Ionization chamber responds fast to low-smoke flaming fires. Unit will
sound a warning chirp when battery is low. Loud piercing, pulsating horn. Twist -off mounting bracket for fast installation and safe battery replacement. UL listed. 5 year limited
warranty. Dimensions: 5" x 1 1/2 "