Item # 21025759
Reliable protection with plug-in simplicity. Features - 120 VAC w/ 2 AA battery backup (batteries included) - Electrochemical sensor - 85 dB at 10 ft - 4 1/2"H x 2 3/4"W x 1 1/2"D - 8 oz - 10-year warranty - UL listed - 1/Each