Model Z1205 Quantity 1 Color Black Material FR4 Specification Main chip: LM393 working voltage: 5V Features Indicates signal output dual signal output (analog output & TTL output) effective output signal of TTL is low level (Signal light will be on when output low level); Analog output 0~5V Good sensitive to butane and natural gas; Durable use and reliable stability; Quick response and recovery performance. Application Good anti-interference perfermance for ethanol steam and smokes; Great for testing home or industrial devices of LPC butane propane. Packing List 1 x Module