Three instruments in one: Air, nitrox, and Gauge. The Vyper features full-decompression capabilities and combines several technological innovations into one product. The Vyper offers everything a diver could possibly need for diving with standard air or nitrox mixes. It can also be used as a depth gauge and timer with profile memory, making it ideal for professional and technical diving. Effortless operation The easy-to-read dot matrix display with large digits and electro-luminescent backlight mean your depth, temperature, and dive time - will all be shown clearly. The simplified three-button operation makes the computer easy to use even when wearing gloves Multi-mode versatility Suunto Vyper includes Air, nitrox and Gauge modes and gas-switching capability. When using enriched air, Suunto Vyper can be programmed for nitrox mixtures between 21% and 100% oxygen. You can also adjust oxygen partial pressure between0.5 and 1.6 bars. In Gauge mode, it can also be used as a depth gauge and timer with profile memory. Console comes with Suunto's pressure gauge which is color coded for ease of reading and gives pressure readings from 0 to 5000 psi; instrument has luminous dial for ease of reading in low light conditions.