Fangrui Product Details 1. Aneng Digital Display Combustible Gas Leak Detector 2. Response Sensitivity: 50ppm (methane) 3. Warm-up Time: About 30 Seconds 4. Detection Range: 50~10000ppm (methane) 5. Power Supply: 3 1.5v No. 7 Batteries (not Included) 6. Automatic Shutdown: The Instrument Will Automatically Shut Down If There Is No Operation For 10 Minutes 7. Cancel Automatic Shutdown: Press The Power Button To Cancel The Automatic Shutdown In The Power-on State. The Instrument Will Hide The Shutdown Symbol 8. Metal Gooseneck Tube, Which Can Be Extended And Bent At Will 9. Va Color Reverse Display, The Value Can Be Seen Clearly In Dark Environment 10. Place The Instrument Sensor On The Gas Tank Switch Port, The Screen Simulation Segment Rises To Red And Is Accompanied By A Rapid Buzzing Alarm, Indicating That There Is A Combustible Gas Leak 11. Gas-sensitive Semiconductor, Fast Response Speed And High Sensitivity 12. Detect Along The Center Of The Gas Stove. When The Gas Concentration Does Not Exceed Of The Lfl Safety Value, The Screen Simulation Segment Does Not Rise And There Is No Buzzer Alarm, Which Means It Is Safe.