The JBL ProAir a400 is the two-channel model in the series and is designed for aquariums where air is needed in two places at the same time - e.g. for two air stones, two filter lifters, or separate tank areas. With a flow rate of 400 l/h and > 140 mbar, it offers noticeable power reserves even at higher counterpressure. Special feature of the a400: The air volume can be regulated electrically and additionally mechanically - for very sensitive adjustment to stocking, air stones, and desired surface movement. Power consumption 5 W, recommended for approx. 160-600 l, sound level 47 dB(A) (at 1 l/min).