CE ROHs certification Carbon Monoxide Detector and co detector alarm for building

CE ROHs certification Carbon Monoxide Detector and co detector alarm for building   Features: 
LCD display with a blue back ground light. 
- Permanent carbon monoxide sensor. 
- Powered by 3 x 1.5V AA batteries. 
- The alarm sound pattern is four short alarm beeps. The red LED will flash while in alarm mode. 
- One 'chirp' every 30 seconds is an indication that the battery is low (need replacement) (green LED still flashes once every 30 seconds) or the unit is malfunctioning (green LED is out. ). 
- Alarm memory feature: If the unit ever alarms, pressing the button, green LED will flashes once every second for one minute and the peak alarm level will indicate on the LCD. 
- Test/Reset button to test the unit electronics and verifies proper unit operational and reset the unit during CO alarm. 
Green and red LED lights that indicate normal operation and alarm status. 

3 digits LCD displayer is optional. 'Err' on the LCD to indicate the unit is malfunctioning. 'Lb' on the LCD to indicate it low battery and need replacement. '999ppm. " On the LCD to indicate CO level over 999ppm. If the Co leakage is less than 999ppm but over 30ppm, it would show its actual concentration. 
Blue back light will be lighted when pressing the test bottom or alarming. 
- The unit will sound 'chirp' and red LED flashes once as power up. 
- Power saving feature: The alarm sound pattern is 4 beeps every 5 seconds for the first 4 minutes. In 4 minutes, it will change to 4 beeps every minute to save the battery. 
Green LED: The green LED flashes every 30 seconds
Specifications:   * 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): 3 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 
* Sensor Life: 3 years 
* Operation ambient: 0 ~ 40, 20% ~ 90%RH 
* Mounting: Wall/Ceiling mounting 
* Dimension 100mm*40mm, Weight: 0.2kg 
* Comply With: CE, EN50291     Parameter :    

Power Supply	3*1.5V AA batteries
Sensor	Electrochemical CO sensor
Audibility	85dB Alarm sound;
Power consumption	0.3mW
Sensor Life	5 years
Mounting	Wall/Ceiling mounting
Dimension	100mm*40mm
weight	200g

  Real-time testing CO concentration 
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