Overall Size: 7-19/32" Long X 1-13/64" Dia.Ideal For Detecting Leaks Of Natural Gas (Methane), Propane Or Butane From Plumbing And AppliancesSensitive, Reliable And Easy To UseFast Response Time, Under 5 SecondsDifferent Alarms For Leaks, Sensor Faults And Low BatteryAutomatically Sets Zero Measurement Baseline Upon Startup In Fresh AirNatural Diffusion Sampling TechniquePower Source: 2 AA Batteries (Included)Comes With Wrist Strap And Instruction Booklet