2 in 1 SMT Carbon Monoxide and Smoke Alarm Smoke Fire Gas Sensor Alarm CO Carbon Monoxide Detector Sound Combo Sensor Tester Battery Operated with Digital Display for CO LevelCategory: Carbon Monoxide LevelsNote:Type 1 is Co Detector ?Type 2 .3 are Co and Smoke Detector .Please make sure which kind of detector you want to buy.Type 11. Package Included: 1 x Carbon Monoxide Alarm, 2 x Screws, 1 x English User Manual.2. Power Supply: 3 AA size batteries (not included)3. Sensitivity & Time: 50ppm, alarms within 60~90 minutes, 100ppm, alarm within 10~40 minutes, 300ppm, alarms within 3minutes.4. Operation Ambient Condition: 5~40?C, 20~90%R.H.Features: 1. Loud 85 decibel alarm, the alarm sound pattern is four short alarm beeps. The red LED will flash while in the alarm mode.One chirp every 30 seconds in an indication that the battery is low (need replacement) (green LED still flashes once every 30 seconds).2. Alarm memory feature, Green and red LED lights that indicate normal operation and alarm status, The carbon monoxide alarm pattern is 4 short beeps.Type 2Packing included: 1 x Carbon monoxide smoke composite detector.Features:1. 2 in 1 Carbon Monoxide+Smoke Detector & Carbon Monoxide Alarm.2. Adopt high reliability electrochemical sensor and infrared photoelectric sensor.3. LCD liquid crystal display density.4. 3*AA 1.5V battery powered, Low current consumption, long standby life, Battery low battery prompt.5. Alarm memory function & Alarm pause (silent mode), double warning: Sound and light alarm / LED indication alarm.6. SMT industrial manufacturing, strong stability.7. Sensor: Electrochemical carbon monoxide sensor and infrared photoelectric sensor.8. Working temperature: 0-50 ?C, working humidity: relative humidity 10%-95%.9. Carbon monoxide gas detection concentration: 000-999ppm, Smoke sensitivity: 0.1% db/m-9.9% db/m.10. Alarm indication: LCD display, sound and light tips.11. Power: 3 AA1.5V batteries, Battery display: low battery alarm.12. Quiescent current: 13. Size: 104mm (diameter) * 35mm (height).14. Scope: barbecue shop, kitchen, bedroom, living room, parking lot, school, library.15. Smoke detector protection area: When the space height is 6 meters to 12 meters, the protection area of one detector is 80 square meters for the g eneral protection site; when the space height is 6 meters or less, the protection area is 60 square meters.Type 3Package includes: 1 * CO And Smoke Detector, 1 * Screws, 1 * User Manual.Features: 1. High accurate electrochemical sensor and infrared photoelectric sensor.2. 9V battery supply(The battery not included). U ltra-long standby time, low current consumption. Low-battery warning.3. Sound & Flash Alarm & LED indicating Alarm. Real human voice prompt.4. SMT manufacture technology, reliable stability.5. Power Supply: 9V battery(one 6F22). Static Current: 10uA. Alarm Current: 30mA.6. Temperature: 0?C-50?C, Relative Humidity: 10-95%.7. Carbon Monoxide Sensor Detect Concentration: 000-999 PPM.8. Alarm Indication: Red LED flashing.9. Size: Approx.10.6*5.1*10.6cm/4.17*2.0*4.17inch.