ita a regulator type ...simply apko krna yeh hai ki jaha ao gas e regulator lagte ho waha yeh product ko lagana hai aur iske baju me he attach karne ke liye hai jaha apko gas ka regulator lagana hai fir apko on krna hai jaise ap regulator ko krte ho...benefit yeh batata hai ki kitna gas hai apke cylinder me .agar kuch leakage hoga toh yeh bata dege apko ya stop krega us leakage ko aur signal dega ...joh ki kafi achi chiz hai accident se bachne ke liye mere ....sell isliye krte hu kyuki mere pass already 4 hai jin me se 3 ghr pr lagya hai Aur 1 waise he pada hai isliye u can go for it condition good