2Pcs Carbon Monoxide Gas Detector with Warning Alarm CO Gas Monoxide Poisoning Smoke Gas Sensor Warn

Sensitivity\/Alarm Time:Within 60~90 minutes at 50ppm CO concentration; Within 10~40 minutes at 100ppm CO concentration; Within 3 minutes at 300ppm CO concentrationAdvanced level of protection, easy to read with the digital display, even in low light conditionsDisplays the level of carbon monoxide the unit is sensingGreen LED: Flashes every to indicate the unit is operating properly. The green LED will also flash before CO reading is taken and when any button is pressed.Red LED : When a dangerous level of carbon monoxide is detected the red LED will pulse and a loud alarm pattern will sound. The carbon monoxide alarm pattern is 4 short beeps, followed by 5 seconds of silence, followed by 4 short beeps with a corresponding red LED flash. This cycle will continue for 4 minutes and then change to 1 cycle every minute until the device is reset or the CO is eliminated.Test\/Reset button is designed for weekly testing if it works properlyand reset the unit during CO alarmLCD Displayer (optional): 4 digits LCD displayerAudibility: 85dB ( at 1m distance ), Frequency 3 - 0.5KHZStandby Current: less than 50AAlarm Current: less than 50mAStandby Mode: Green Led flashes once every Alarm Mode : Red Led quickly flashes 4 times with unit chirping every 5 seconds, then repeat,Low-bat Indicator: every 30s as battery lower than 3.3V with green LED flashing and Lb on LCDMal-function Indicator: every 30s with green LED out and Err on LCDPower consumption: 0.3mWSize: 10 x 4cmPowered By: 3 x AA Batteries (Not included)A perfect item for protecting your family from the dangers of carbon monoxideAlerts users when batteries needs to be replacedThis alarm is highly recommended to be mounted on a wall surfaceCompact, & easy to operateSpecifications:Sensor: Electrochemical CO sensorColour:WhiteMaterial:ABS Package Contents:2 * Carbon Monoxide Alarm (not included battery ) Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.