The new IQ-650 Element from Tusa is a full function. single button wrist dive computer with an exceptionally reasonable price. It features a deep stop function for safety and is activated when a diver exceeds 80ft for more than 1 second. When ascended past 50ft the computer will display a Deep Safety Stop screen and the recommended safety stop at 40ft for a period of 2 minutes. This feature is highly recommended, but not mandatory and will not adversely affect the remaining No-Decompression Limits of the dive if it is not served. The TUSA Element Wrist dive Computer is a Single button puck-style that offers user-replaceable battery with hot-swap! And offers Nitrox operating modes up to 50%.