2PCS LCD-Carbon-Monoxide Warning Alarm CO Detector Smoke Poisoning Gas Sensor

2PCS LCD-Carbon-Monoxide Warning Alarm CO Detector Smoke Poisoning Gas Sensor DescriptionThis product is made of high quality material, durable and stable use.Applicable to all fields: residential, shops, hotels, restaurants, office buildings, schools, banks, libraries, computer rooms, warehouses, etc.The alarm time depends on the carbon monoxide concentration level.The carbon monoxide alarm screen can accurately measure the carbon monoxide concentration and its concentration data.The carbon monoxide detector will notify you immediately when the concentration reaches a certain level, thus minimizing false alarmsBattery powered combination alarms provide carbon monoxide hazard protection in a single unit for added convenience.The Voice alarm feature provides audible notification of detected hazards to protect your family's lifeand property from carbon monoxide detectors. (Battery not included)Specification:100% brand new with high qualityPower Supply: 3 AA batteries (Not included)Working range: 4?~38?Alarm sound: 85DB (3m)Alarm current: <80mA, static current: <80uALow power alarm: every 30 seconds, LED display: LbRated voltage: 220V 50HZAlarm concentration: 50PPM: 60-90 minutes, 100PPM: 10-40 minutes, 300PPM: 3 minutesStatic indicator: Green LED flashes every 30 secondsSize: Diameter 100mm*38mmPackage Included:2 x Carbon Monoxide AlarmNote:The colors may be a little difference for the different monitor display.Please check as much as possible to make sure the item is the one that you need.Please allow 0.5-1 inch difference due to manual measurement.(1inch=2.54cm)