Here's information for shopping:

Features: It typically includes an LED display on the lid to show the real-time temperature of the beverage inside, often in Celsius. 

Insulation: These bottles are often double-walled and vacuum-insulated, designed to keep drinks hot for several hours (e.g., up to 12 hours) and cold for longer periods (e.g., up to 24 hours). 

Capacity & Material: They commonly have a capacity of around 500ml and are made from stainless steel for durability and rust resistance. 

Convenience: Many models feature leak-proof lids and are designed for easy cleaning.