Akuana product development team designs and manufactures state of art diving equipment for cold water divers. Simply put on inside the wetsuit, the divers will overcome the potential hypothermia problem. Relying on the latest micro electronical technology, we are making the diving much simpler and safer. We are improving the interaction between humans and diving equipment and providing simple intuitive user interfaces which are not existed before. Military divers all over the world are using opah heating vest, like Korean navy and china etc. We use Lithium Iron Phosphate (LiFePO₄) batteries, which are known for their excellent safety, stability, and long cycle life. Compared to traditional lithium-ion batteries, LiFePO₄ batteries are far less prone to overheating or thermal runaway, making them a much safer choice for demanding applications. In addition, they offer reliable performance, high efficiency, and strong durability, ensuring consistent power delivery with minimal risk. Our heated base layer comes with two options. Built-in battery: The battery is integrated and in contact with the body. While this may cause some discomfort, it eliminates the need to make holes in the heated base layer. External battery: This option uses a simple cable port that passes through the wetsuit without causing any damage. The same solution can also be applied to drysuits, for which we provide dedicated pass-through fittings. The external battery option effectively solves both the safety and comfort issues.