1Designed with headphone jack, can be used in noisy environment and can guarantee the quality and accuracy of detection. 2Sound and light alarm to prevent combustible gas leakage, remind you to be safe. 3The large 16 inches sensor has high sensitivity, provides quick identification and determination of combustible gas leakage location. 4With low battery alarm reminder function to remind you to change batteries in time and insure the detector works normally. 5Handheld design, easy to operate, visual and acoustic alarm can accurately detect gas resources.