Shearwater Peregrine dive computer ONLY is a beautifully designed computer suitable for an everyday diver. It is extremely easy to use and understand for even the least experienced divers. Peregrine can be used in several modes: air, nitrox up to 40%, 3 gas nitrox up to 100% O2, and gauge. It is powered by the trusted Bühlmann ZHL-C algorithm, the same one that powers all other computers from the Shearwater fleet. You will be amazed by the 320 x 240 QVGA screen resolution and full-color LED LCD display. It is powered by a rechargeable Li-ion battery and holds the charge for up to 30 hours on medium brightness. You will enjoy the generous logbook capacity that will allow you to store up to 200 hours worth of dives. For divers looking to customize, additional accessories can be purchased.