Aqua Lung i450t Hoseless Air Integrated Wrist Watch Dive Computer w/ USB Hoseless gas integration. Our patented Gas Time Remaining Algorithm provides calculations in real time, allowing accurate gas management. Intuitive design and menu navigation. Digital compass. Features a North reference, return bearing lock, and declination adjustment. Free Dive mode. Manage your free diving with depth, bottom and surface times, dedicated free dive memory and more. Multiple gas capability manages up to 3 Nitrox mixes (with 3 transmitters), each with individual PO2 set points.