FIRST ALERT CO400 Carbon Monoxide Alarm, Battery Power Source, Electrochemical Sensor, Audible, Visual Alarm, 85 dB Keys & Safes Dual mode selector easily converts

Dual mode selector easily converts from rotation only to hammer drill mode

Saw Diameter: 3-3/4

3-1/2 in Saw Diameter

Reinforced carbide head for increased durability

FIRST ALERT CO400 Carbon Monoxide Alarm, Battery Power Source, Electrochemical Sensor, Audible, Visual Alarm, 85 dB Keys & Safes Dual mode selector easily convertsFIRST ALERT Carbon Monoxide Alarm, Electrochemical Detection Method, Battery, Audible, Visual Alarm, 85 dB Sound Level, Electrochemical Sensor, Wall Mounting, White, 40 to 100 deg F, 3. 4 in Width, 1 1 2 in Height, 5 in Depth, Additional Information: Uses (1) 9 V BatteryFeatures: Alerts you to CO threats the first ALERT battery operated carbon monoxide alarm uses an advanced electrochemical CO sensor to detect elevated carbon monoxide levels, when CO