The Mares Puc is a super intuitive, easy to use, full-featured RGBM nitrox computer at an extremely competitive price. Now they are doing it again. The Puck Pro implements a larger display in a slimmer design, and offers added upgradeable firmware and multigas capability. This dive computer has all the bells and whistles, no unnecessary frills. Features: Slim design for a perfect fit Large display for superior readability Intuitive user interface EAN (NITROX) from 21% to 99% Gas Switching Software Upgradeable One button control Mineral glass display Style 414122