Technologically advanced with a voice warning system that announces “Fire, Carbon Monoxide, Low Battery, or Smart Hush™ activation.”\Features\ - 2 AA batteries (included)\ - Fuel cell sensor\ - 85 dB at 10'\ - 5 3/4" x 1 11/16" \ - 13 oz \ - 10-year warranty\ - UL listed\ - 1/Each Model Number: KN-COSM-B|UOM: EA