VEVOR Sous Vide Machine, Bluetooth Wi-Fi Connect App Control Sous Vide Cooker, 1200W Immersion Circulator, Digital Display Control, 86-203℉ Temperature and Timer, IPX7 Waterproof, Fast Heating

It circulates water and can heat it at the same time.

There is a water level scale on the product, which is min-max. When adding water to the product, it needs to be within this range. If it is not within this range, the product will automatically alarm to remind you.

Yes, they can be switched on the APP.