for aquariums from 40 to 500 litres (10 to 135 USgal.) Flow rate: 1,500 to about 4,500l/h (400 to 1,175 USgal./h) Energy consumption: 5 to 7W Voltage / frequency: 230V/50Hz (115V/60Hz) Cable length: 2m (8.7 in.) Dimensions: diam. 70mm (2.75 in.) Ejection: diam. 40/15mm (1.5/.59 in.) Magnet Holder with Silence clamp up to a glass thickness of 15mm (1/2")