Get an alert on your phone when dangerous gasoline fumes collect in your boat's bilge. The new Life-Gard Mobile gasoline fume detector is battery powered and needs no hook-up wiring. Ideal for Inboard/Outboards. Installs in your boat's engine compartment with just four screws, no dashboard wiring or sensor wiring. Then download the free iOS Fume Detector app to your phone (android coming soon). Now your boat and its occupants are safer. Audible alarm too. Change the 8 D cell batteries once a year. A 12V boat battery adapter is also included. Sensor element included, never needs to be replaced and has a lifetime guarantee.