SPECS Technology includes: High contrast display with extra large numbers, easy access menu, 12/24 time format with calendar and seconds, precision stopwatch, second time setting, alarm clock, backlit display, surf time, desaturation and no fly time calculator, lets you know when battery is empty, metric or imperial units, long-lasting battery, battery replaceable by user DESIGN & TECHNOLOGY Larger battery for long-lasting life Case diameter: 1 7/8 in (48 mm) and high contrast display: 1 3/8 in (35 mm) Mineral glass computer monitor with steel buttons resistant up to 393 feet Plastic/Steel bezel and stainless-steel back cover Programs for scuba diving, recreational (can turn off alarms), or free diving Data is acquired 4 times faster: every 5 seconds while scuba diving and every 2 seconds while free diving Rubber wrist band with stainless steel buckle Plastic/Steel bezel and back cover Download/analyze data with the Cressi Interface application (sold separately)