1.CO alarm with EN50291
2.9V battery operated,LCD display(20-999PPM)
3.low voltage alarm signal
4.sound above 85db at 1M

Co alarm 

NEMOTO / FIGARO / SIXTH SENSE CO sensor

Power Supply: DC 9V battery operated

Sensitivity Setting: conforms to EN50291

Standby Current: <10μA

Alarm Current: <30mA

Operation Ambient Condition: 4~38, 25~85%RH

Sensor Type: electrochemical

Sensor life: >5 Years

LCD display range: 20-999PPM

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)

EN 50291 certification