BestDealUSA Electric Carbon Monoxide Warning Detection Alarm w/ LCD Display
* Color: White* Sensor: Electrochemical CO sensor* Sensitivity/Alarm Time:o Within 60~90 minutes at 50ppm CO concentration;o Within 10~40 minutes at 100ppm CO concentration;o Within 3 minutes at 300ppm CO concentration* LCD Displayer (optional): 4 digits LCD displayer* Audibility: 85dB ( at 1m distance ), Frequency 3 - 0.5KHZ* Standby Current: <50?A* Alarm Mode : 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* Size: 10 x 4cm* Powered By: 3 x AA Batteries (Not included)package content:* 1 x Carbon Monoxide Alarm* 1 x English User Manual