Carbon Monoxide and Smoke Alarm Battery Chemistry Alkaline Battery Location Side Battery Locking Pin Yes Battery Size AA Communication Protocol Wireless Compatible With BRK Wireless Interconnect Alarms Detector Type Smoke/CO Detector Features Voice Alert Includes (2) AA Batteries Number of Tandem Detectors 18 Power Source Removable Battery Sensor Type Photoelectric Visual Alert Type LED Volume Level 85 dB @ 10 ft Alert Type Sound Battery Backup No Color White Detects Smoke