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All of the standard dive computer features are present in terms of Nitrox compatibility (21% - 50%, single mix), deep stop, decompression information, backlight and dive planning, but with a range of user-adjustable parameters including safety stop depth and time and 6 levels of personal adjustments. In free-diving mode the computer uses algorithms designed to aid in the prevention of problems and and suggest recovery times specific to the sport, but in Scuba mode, the computer uses a tried and tested Buhlmann-based model making it suitable for recreational and limited decompression dives. Beyond dive data, the Jack also includes a wide range of general outdoors functions such as a 3D compass, altimeter, barometer, stopwatch and pedometer, making it a very versatile all-purpose device. The composite and stainless steel case is designed to meet the rigours of both scuba and freediving with a maximum depth rating of 150 metres. The computer is USB rechargeable with up to 40 hours' continuous use in dive mode.