feature: [Combined carbon monoxide and smoke detector] Adopting advanced electrochemical carbon monoxide sensor and photoelectric sensor, the detection of carbon monoxide and smoke is accurate. [Warning of flashing and loud alarm mode] It will warn you with a flashing LED and a loud alarm sound when a concentration of carbon monoxide and smoke is detected. dangerous smoke or carbon monoxide is detected. LED displayIt can clearly display the concentration of carbon monoxide in real time in the ambient air . [Battery Powered] Powered by 2*AAA(not included), no need to charge, no bulky wires, easy to use. Easy InstallationA quote pack is included, easy to install the detector on the walls of bedrooms, living rooms, kitchens, etc. feature: White Material:ABS Detection gas type:CO, smoke Alarm mode: flashing light + loud sound alarm Carbon Monoxide Sensor Type: Electrochemical Operating Temperature: -1060 Relative Humidity:10~95%RH Carbon Monoxide Sensitivity: 000-999PPM Alarm sounder: 75decibels (1 meter) Alarm concentration: 50ppm: screen lights up, voice alarm of 150ppm Power supply:DC3V, 2AAA batteries (not included) Product size:6*6*2.5cm/2.3*2.3*0.98inch Product weight:70g/2.4oz Pay attention: Batteries not included . packing list: 1*detector 1*bag 1*user manual