i300 With only two buttons and simple operation, it's very easy to use, and the LCD is large. I especially recommend it for beginners; I think I've used it for over 100 dives. There are some scratches, but no cracks. The battery is dead, so please replace it before use. If you buy it together with other items I have listed, I think I can offer a small discount. Main features: ・4 operation modes: Air / Nitrox / Gauge (with run timer) / Freediving (Performs track calculations necessary for switching between DIVE and Free, allowing you to switch between dive mode and freediving mode on the same day) ・User-replaceable battery, with data retention function that preserves settings and calculations during replacement ・Backlight for easy viewing in dark places