BRK SMICO100 AC Smoke and Carbon Monoxide Alarm, Carbon Monoxide Smoke, Removable Battery, Battery Backup G5840326 The new design features a The new design features a more robust cage and internal parts 3 16 in x 6 in Screw Holding Flathead Screwdriver Number of Awls and Scribers 1 Number of Miscellaneous Tools 0 Number of Drilling SMICO105 AC Alert Type Sound Test Button Yes Volume Level 85 dB @ 10 ft Communication Protocol Hardwired Interconnect For Location Indoor Includes Mounting Hardware Yes For Environment Bedroom Operating Frequency 60 Hz Humidity Operating Range 10% to 95% RH Battery Location Side Receiver Range 10 ft Sensor Type Electrochemical CO5120PDBN