BrassCraft BCGLD01 X6 Safety Plus Portable Gas Leak Detection Wand Compact, Handheld & Portable Detects Natural, Lp (propane), Butane & Methane Gases Visual & Audio Alerts Intuitive, User-friendly Operation & Features Imbedded Microprocessor With Low-battery Alert Detects natural, LP (propane), butane and methane gases Intuitive, user-friendly operation. Automatic, easy-to-see yellow & red lights PLUS audible alarm indicates a leak Built-in microprocessor with low battery alert Protective black cap helps safeguard gas sensor to reduce risk of contamination from dust, water, etc Requires (2) AA alkaline batteries (not included) Detects natural, LP (propane), butane and methane gases Intuitive, user-friendly operation. Automatic, easy-to-see yellow & red lights PLUS audible alarm indicates a leak Built-in microprocessor with low battery alert Protective black cap helps safeguard gas sensor to reduce risk of contamination from dust, water, etc Requires (2) AA alkaline batteries (not included)