BRK SMICO100 AC Smoke and Carbon Monoxide Alarm, Carbon Monoxide Smoke, Removable Battery, Battery Backup G5840326 Cannot Be Sold Outside United Cannot Be Sold Outside United States — They cannot be sold outside the United States due to product registration requirements Item Combustible Gas Detector Detects Acetaldehyde Detector Type Smoke CO Detector 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