Features:One chirp every 30s in an indication that the battery is low (need replacement) (green LED still flashes once every 30s). The alarm sound pattern is four short alarm beeps. The red LED will flash while in the alarm mode. - Loud 85 decibel alarm. - Easy to read with the digital display, even in low light conditions. - The level of protection against the risk of advanced, carbon monoxide. The level of protection against the risk of advanced, carbon monoxide. - Alarm memory feature: If the unit ever alarms, pressing the button, green - - LED will flashes once every second for one minute and the peak alarm level will be indicated on the LCD. Specification:Alarm Sound: 85DB (3meters)Alarm Current: 0.3m - AAlarm Current: <80(m - A)Static Current: <80(u - A)Relative Humidity: ≤95%RHApplication; Household/Hotel/Kitchen/Supermarket/Office - Installation: wall mounted/ceiling mounted/mounted - Detection angle: ∠360°Communication Mode: Wireless - Detection Distance: 20m - Launch Distance: 30m - Type: Carbon monoxide alarm - Low power alarm: every 30s send out "ji" sound, LCD display: Lb - Sensitivity & Time:30ppm, alarms within 2H; 50ppm, alarm within 60~90 min 100ppm, alarms within 10~40 min;300ppm, alarms within 3min - Standby Current: <50u - A(Without LCD);<200u - A(With LCD)Alarm Current: <75m - AOperation Ambient Condition: 5~40o - C, 20~90%RHStatic Indication: green LED flickers every 30s Package included:1 x Carbon Monoxide Alarm2 x Screws1 x User Manual