That thing looks tiny. Not to mention rubber elbows freak the hell out of me.
"Water will based on siphon phenomenon of the water level, safetly without power supply"
I am going to go out on a limb and say this product is from Asia....
Also the photos are confusing as hell. Why is there a clear one and a blue one in some photos, and why does the clear one have two holes in it? It is set up differently in each photo....
1. Is the blue part the one that goes in the tank? and the clear one connects to it outside? But then why is the clear one open on the top? And why the two drain pipes off of it?
2. If the clear one goes on the inside then it is the same question! Why does it have two drain pipes off it then?