CO alarm GS808 with LED

Co alarm GS808 NEMOTO / FIGARO / SIXTH SENSE CO sensor Power Supply: DC 9V battery operated Sensitivity Setting: conforms to EN50291 Standby Current: <80μA Alarm Current: <30mA Operation Ambient Condition: 4 38, 25 85%RH Sensor Type: electrochemical Sensor life: >5 Years Display range: 30-500PPM Hush function Low battery voltage alarm Recommended battery: Gold peak 1604A, Gold power G6F22 Alarm sound: ≥85DB at 100cm at 3.4±0.5KHz pulsing alarm (The alarm pattern is 4 short beeps-followed by 5 seconds of silence-followed by 4 short beeps with a corresponding LED flash ,repeat this alarm pattern)