1. Double-Walled Design

The bento box has an inner and outer layer. Between them is a heating compartment.

2. Heating Module with Calcium Oxide

Inside the heating chamber is a pouch filled with calcium oxide (CaO), also known as quicklime. A separate pouch with water reservoir is also included.

3. Activation

Pull a cord to release the water. When water contacts the quicklime, a chemical reaction occurs: CaO + H₂O → Ca(OH)₂ + heat.

4. Heating the Meal

The generated heat transfers through the inner wall to warm the food compartment. Within minutes, the meal reaches a pleasant temperature.

5. Safe & Easy to Use

The process produces no flame or toxic gases, only water steam, making it safe in offices, schools, or while traveling.