This is the Mini QUEST Quick Underwater Erasable Slate Technology for Scuba Diving and Snorkeling Features: 30% smaller than the full-sized Quest, palm-sized, and stows easily Tough, built-in rotating cover protects the Mini Quest, rotates 360Adeg and snaps securely to back or front Patented white magnetic screen has superior contrast for the best readability at depth Smaller size with protective hinged, rotating cover. Stows easily in BCD pocket! The Mini-QuestA has revolutionized underwater communications! Write on the patented magnetic screen, erase, write again! Message after message, real underwater communication occurs. The magnetic screen is easily erased with the push of the thumb. A removable double-sided conventional slate on the back allows for permanent record of important information.