Product Information The i100 is the perfect dive computer for beginner divers. With a single navigation button, you can manage four modes and two types of gas. Settings and calculations are retained during battery replacement, and it also features safety functions such as audible alarms and highly visible LED warning lights. This compact and affordable dive computer has everything a diver needs. Product Description - 4 modes [Air/Nitrox/Gauge/Freediving] - User-replaceable battery (CR2450) retains settings and calculations during battery replacement - Intuitive one-button navigation - Compatible with air and nitrox gases - Equipped with audible alarms and LED warning lights, providing comprehensive safety features - Software that users can upgrade to the latest version (requires a separate download cable) - Pre-dive function helps you plan your next dive. - Water sensor automatically switches to dive mode when activated. - You can check past dive history (maximum depth and dive time) with a single button press. - History mode displays total number of dives, maximum depth, total dive time, and minimum water temperature. - Supports up to 100% oxygen. - Deep stop function with countdown timer (optional) is also available. - Sea water or fresh water can be selected. - Automatic altitude adjustment function enables accurate profile tracking. - Easy to use "Diver Log" software on Mac, PC, and mobile devices (requires a separate USB download cable). This software allows you to save and share photos and videos, manage dive computer settings, view log and profile data, and add locations and records. *Batteries have been replaced and inspected, so you can use it immediately. Pressure tested. Please check the images carefully before purchasing. Returns and claims are not accepted.