The longhorn 3AA battery powered series carbon monoxide alarm LH-921P adopts up-to-date electrochemical sensor with a 5 year's lifespan. Sensor Life Monitor alerts you when sensor life has expired. 

Engineering Specification: 

* Power Supply: 3*1.5V AA batteries

* Sensor: Electrochemical CO sensor

* Alarm Style: Per EN50291

* Sensitivity/Alarm Time:

     Within 60~90 minutes @ 50ppm CO concentration;

     Within 10~40 minutes @ 100ppm CO concentration;

     Within 3 minutes @ 300ppm CO concentration

* LCD Displayer (optional): 4 digits LCD displayer

* Audibility: 85dB ( at 1m distance ), Frequency 3±0.5KHZ

* Led Indication /Sound Pattern:

     Standby: Green Led flashes once every 30 seconds

     Alarm: Red Led quickly flashes 4 times with unit chirping every 5 seconds, then repeat,

* Low-bat Indicator:

     Chirp every 30s as battery lower than 3.3V with green LED flashing and Lb on LCD

* Mal-function Indicator: Chirp every 30s with green LED out and Err on LCD

* Power consumption: 0.3mW

* Dimension 100mm*40mm, Weight: 0.2kg

* Comply With: CE, EN50291

LCD Carbon monoxide detector with EN50291