... screw2,Waterproof circuit board 10,Locking cover3,Header cover(433MHZ antennas or infrared optoelectronic interfaces) 11,Pins4,Ultrasonic transducer 12,Protective ... ≥6years(3800mA)or 12 years(8200mA)Communication M-BUS,433MHZ Antennas or Infrared optoelectronicinterfacesRatio of measuring range 100:1Ambient temper ature ...