Popular sell CO sensor for domestic use

MQ-7 gas sensor has high sensitity to Carbon Monoxide. The sensor could be used to detect different gases contains CO, it is with low cost and suitable for different application.
Sensor Type: Semiconductor
Standard Encapsulation: Plastic
Detection Gas: Carbon Monoxide
Concentration: 10-10000ppm CO
Circuit Loop Voltage: Vc ≤10V DC
Heater Voltage VH: 5.0V±0.2V AcorDC(High)
1.5V±0.1V ACorDC(Low)
Heater Time TL: 60±1S(High)90±1S(Low)
Load Resistance RL: Adjustable
Character Heater Resistance RH: 31Ω±3Ω(Room Tem. )
Heater consumption PH: ≤350mW
Sensing Resistance Rs: 2KΩ-20KΩ(in 100ppm CO)
Sensitivity S: Rs(in air)/Rs(100ppm CO)≥5
Slope: α ≤0.6(R300ppm/R100ppm CO)
Condition: Tem. 20℃±2℃; Humidity: 65%±5%RH
Standard test circuit: Vc: 5.0V±0.1V;
VH(High): 5.0V±0.1V;
VH(Low): 1.5V±0.1V
Preheat time: Over 48 hours