YH-737B is an extremely practical oxygenator for long journeys, thanks to the possibility of power supply through the car's cigarette lighter, we can therefore save the batteries for the fishing trip, constantly guaranteeing a delivery volume of about 1lt. of oxygen per minute. The automatic switching function is particularly useful, i.e. the automatic switch from one type of power supply to another when we insert the power cable. Batteries: 2 type D (NOT INCLUDED). Measures: 80 x 40 x 150mm. Weight: 480gr (with batteries). In the package: oxygenator, tube, stone, clip and DC12V car power cable.