Meet the Cressi Nepto Free Divers Computer: With a case diameter of only 1.9" (48mm) and a high-contrast display of 1.38" (35mm), Nepto is an extremely compact watch-computer specific for freediving. This innovative product boasts an algorithm developed by Cressi, which protects the free diver from the risk of Taravana, and a function that avoids the risk of pulmonary edema. Mineral glass, heavy duty case with steel buttons for resistance to water pressure up to 393' (120m), and a rubber strap with stainless steel buckle so, it's ready for whatever paces you put it through. The Cressi Nepto Computer has a user-friendly menu for navigating computer functions. The computer has a 12/24-time format with calendar and seconds, precision stopwatch, timer (countdown), second time setting, alarm clock and a backlit display. There is a tide indicator, low battery indicator, can be set for metric or imperial units of measure and has a long-life CR2450 3V lithium battery for power that is user replaceable. Sleep mode to increase battery life. The computers unique freediving programs Taravana risk reduction algorithm with 8 levels and pulmonary edema risk reduction function with approach dive calculation displays of all diving parameters of depth, temperature, dive calculator, maximum dive depth, dive time, length of surface interval between each dive, length of diving session, maximum descent and ascent speed indication, depth, dive time and surface interval alarms. It also has a recovery time alarm, hydration alarm, and alarms that can be set at dive phase. Computer can be set for fresh or saltwater and has a lock mode for snorkeling or swimming activities. The computers logbook has a variable data logging interval, is available during the diving session and provides indication of session parameters and of each dive. The optional Bluetooth interface function provides visualization of diving profile. Computer comes in multiple colors and an owner's manual.