These are handheld electric milk frothers and drink mixers.

They are battery-operated, typically using 2 AA batteries. 

The devices feature a simple one-touch operation. 

They can be used for frothing milk for cappuccinos and lattes, as well as mixing eggs or protein shakes. 

The whisk is made of stainless steel for durability and easy cleaning. 

The compact, handheld design makes them easy to store and transport.