I bought it to install it in a shower hose in a toilet whose faucet "ran" no matter how tight I closed it, and I didn't want to call a plumber just to change the rubber gaskets in a faucet, so I bought it to put it on top and close the flow switch to stop it from running. It did stop running, but it started running from the... flow switch button...
In conclusion, as a phone it will do the job, its build quality shows value for money, but don't expect much from the flow switch...

I bought 3 pieces. The first one I tried, the flow control button popped out near the eye. Luckily it didn't hit me. The second one I tried works satisfactorily so far. The third one works moderately because when you open the button for free flow, it doesn't open and creates a moderate flow. It's for throwing away... and probably dangerous. Wear protective glasses when using them...!!!

Due to almost zero pressure, I am considering plugging some holes in order to increase the pressure in the remaining ones. Otherwise, this purchase is a failure

Not recommended for those who do not have water pressure. We spend 3 hours in the bathroom, there is no pressure at all.