Detect dangerous gas fumes before they make trouble. Now every inboard and sterndrive powerboat owner can afford the protection that a gasoline vapor detector provides. The M-1 fits in a standard 2" instrument hole and includes an MS-2 sensor. Key Features Draws 210mA. 7-14V DC 2"Dia. cutout Monitors gasoline and propane Alarm sounds at 16%-20% of the lower explosive level with a 85db horn Minimum vapor level for activation is 18-20% LEL @70F Instantaneous readings Test and mute button Requires 12V DC One remote sensor Includes 20' sensor wire only