Practical & beautiful application for freedivers. If you want to increase your breath hold time underwater this is the best way to do it. ********************* ******* FEATURES: ** ********************* - CO2 tables - O2 tables - MIXED tables - Custom tables!!! (you can create your own best setup) - SOUND FEEDBACK - VIBRATIONS feedback (iPhone only) - STOPWATCH to measure your apnea times with easy, big stop button and optional warmup time ****************************************************************** TRAIN your body to stay LONGER UNDER WATER on single breath! ******************************************************************