Model:FC-22-IQuantity:1Color:Blue + silverMaterial:PCBFeatures:Gas sensitive material: SnO2， conductivity increase according to noxious gas concentration. MQ135 sensor also sensitive to sulfide， benzene steam， smoke， etc.Specification:With power and TTL signal output instruction. With TTL output and AO analog output. Effective signal is low level. Analog output voltage: 0~5V. Quick response recover.Application:Widely use in household and environment. Great for Arduino DIY.English Manual/Spec:YesPacking List:1 x ModuleDimensions: 1.34 in x 0.79 in x 0.83 in (3.4 cm x 2.0 cm x 2.1 cm)Weight: 0.18 oz (5 g)<img src="//112.74.112.28/down/products/193001/193001_000.jpg">