Pen Type DesignThe product is 6.3 inches long and 0.78 inches wide, weight is 2.04 ounces and comes with a pen hook that allows it to fit in a shirt pocket.If not in use for a long time, remove the battery. In some fixed scenarios, strict gas detection products can save you from worry.Batteries Included and Directions for usingPackage include 1*50A Gas Leak Detector,2x AAA Batteries, 1x User Manual. Directions for using: 1. The system warm-up time less than 60 seconds. 2. LCD indicates battery replacement status. 3. Automatic power off after 5 minutes without operation or gas detection.Other key informationTypical catalytic sensor>1 year, response time: determined by gas type.Low alarm:2000ppm, High alarm: 4000ppm. Drift: Zero drift less than 2% FS per half year, sensitivity drift less than 3%FS per half year.Combustible Gas Leak DetectorThe product is suitable for detecting liquefied petroleum gas, methane, ethane, propane, butane, natural gas, coal gas, gas fuel, liquefied natural gas, etc., accurately locating gas leakage, reducing the risk of gas explosion, and ensuring the safety of family and property.LED & Audio Gas AlarmPress the red button on and warm-up for a 20-second preheating periodg. Point it towards suspicious areas, and it quickly detects leaks in just 3 seconds. The gas detector is equipped with a visual alarm and an audible alarm. When the machine detects a gas, the bar graph on the display will increase as the concentration increases, and the display will turn red when the gas concentration is too high. At the same time, the alarm beeps and the frequency of the beep increases as the concentration increases.