7028.900 TUNZE® Aquawind is an especially low-noise aquarium ventilator provided with a 5 V low-voltage power supply unit. Moreover, it comes with an attachment means, which can be used for every aquarium edge up to 25 mm (.98 in.). It produces a laminar air movement over the surface of the water, accelerating the evaporation process and thus achieving a cooling of the water. In standard aquariums, the cooling may amount to 1° to 2° Celsius (1.8° to 3.6° F) on 500 litres (132 USgal.). Power supply unit: 100 – 240 V / 50 – 60 Hz, 3,5 W Dual speed adjustment, with power supply unit and universal holder. Dimensions (L x W x H): 270 x 100 x 30 mm (10.6 x 3.9 x 1.13 in.).