https://support.google.com/edu/classroom/thread/322538497?hl=en&sjid=15105855898607434209-NC

About WOPET W035000 mAh Battery: The cordless, battery-powered design means you can place the cat water fountain anywhere in your home, and the 5000 mAh battery provides up to 30 days of continuous use on a single charge.  Super Quiet Pump: This stylish and unique ceramic cat fountain is ultra-quiet (less than 25 decibels), and the sound of the pump is barely audible. It won't interfere...

https://support.google.com/edu/classroom/thread/322536699?hl=en&sjid=16380884883464134798-NC