Very good. I used it at my son's baptism in a chapel in the forest. I put it in the large water bottles. You press the button and water flows into the glass, you press the button and it stops flowing. If the button is held down for too long, it stops automatically.

The battery takes several hours to fully charge the first time. It's press-and-go, press-and-close, so be careful not to forget or accidentally press the button, as it will empty the entire bottle and burn the motor.
Add your own tube (available in medical supplies), it only has one instead of the two shown in the photo. It can also be charged with a mobile charger, and the output power is more than enough for a 220ml cup. Be careful because it may drip slightly afterwards. The only issue I have (besides not knowing how long it will last) is the cleanliness issue inside. If not used frequently and over time, it may develop mold and smell, although the motor has two screws, can you open it?

A very good product for its price! Very convenient for those who don't want to have the machine for bottles in their home