Features: 1. Made of high quality ABS plastic material, durable to use. 2. Low power consumption and high efficient, reliable operation, service life. 3. Silent and no noise design: ensuring stable working state, no disturbing of surrounding fishes. 4. Come with 4 suction cups: convenient to be fixed onto the water pump. 5. Double water pipes connector: one is 7.5mm dia and 4mm inner dia, another one is 12mm dia and 8mm inner dia, for replacement of water pipe.