This is the ideal cooling solution for small aquariums. Can be easily bulkheaded through a 1 1/4". Provides continuous chilling when plugged in to a power source, it does not have an on/off switch.
Everything is as advertised except the quality control.
Ordered and received two units in decent time.
Unfortunately one of the crimp connections for a fan had no connection, I was able to trace the problem and repair. The claim that every unit is tested before shipping apparently falls short.
Good luck.