The SEAC Screen Computer Console w-SPG has a large screen with a simple user interface and large digits. The large screen allows for more information to be displayed on the screen but the computer itself is quite thin on your wrist. The Two button user interface let you navigate in and out of the menu with ease. Three dive modes Air, Nitrox and Gauge mode is all you need for recreational diving and Freediving. Console includes a SPG in PSI up to 4000 PSI. Screen dive computer satisfies both the most experienced divers with specific technical needs as well as novices looking for a comprehensive, user-friendly device. Its name focuses the attention to the large dot matrix display that allows you to view all the data of the dive profile in a single screen, with clear and distinct characters. The user can adjust the contrast and brightness, as well as the time and mode - automatic or manual - of the backlight. Here are the three main functions of the SEAC Screen: Scuba, Gauge and Freedive. In Scuba mode, the dive profile is expertly managed by the Bühlmann ZHL-16C decompression algorithm. The computer supports 1 or 2 mixes with O2 up to 99%, advising the user the most suitable time to change the mix, while diving. In Gauge mode, the SEAC Screen computer displays depth and stopwatch data; a fully independent dive management system for more experienced divers. In Freedive mode, breath-hold divers can view surface intervals and dive times as well as current and maximum depths reached during the session. In terms of safety, the SEAC Screen is your trusted dive companion in and out of the water. Depending on the diver's preference, it can be set to perform more conservative calculations. Sound alarms and warning lights alert the user in case of violation of decompression stops, excessive ascent rates and exceeding the maximum depth allowed (MOD) for all gas mixes being used. The device also calculates the NoFly times, desaturation times and the maximum altitude allowable for repetitive diving. SEAC Screen’s firmware update and logbook software for PC/Mac are available at no charge. To download data, just connect the SEAC Screen with its appropriate USB cable (optional). Modes: SCUBA MODE: Bühlmann ZHL-16C deco algorithm, with managing for 1 or 2 mixes (air, Nitrox, or mixes with O2 concentration up to 99%). FREEDIVING MODE: Dive/surface time, current/maximum depth. GAUGE MODE: Depth gauge and stopwatch to manage your dive profiles independently. Key Features: Console including computer Screen and pressure gauge (PSI) 100 M Water Resistant LCD screen with contrast and adjustable backlight intensity. OS/WINDOWS Dive Download manager App User replaceable 2450 battery Adjustable Backlight Date Optional USB Cable Alarms Antilock Shield included Screen Compass Internal system: pivoting, in air • Case: high-performance ABS • Glass: High-performance polycarbonate • Face: luminescent • Scale: 0-360° (10 degree increments)