This is a Mares dive computer. Advanced and training divers may combine it with an LED module, but it's also recommended for beginners on its own. The color bar display allows you to visually check your current status, and the high contrast makes the numbers easy to read even at deep depths, which helps reduce anxiety. If you've been wanting your own dive computer instead of renting, please consider this! Used 3 times (3 dives). The battery is almost dead, so it will need to be replaced soon, which is why I'm selling it at a lower price. Mares Smart Air dive computer, perfect for diving, in black and durable. - Brand: mares - Model: Smart Air - Function: Dive computer - Color: Black - Country of Manufacture: Bulgaria Thank you for looking. #scubadiving #divecomputer #beginnerdiver