This is the OMER Umberto Pelizzari Free Diving Computer with Heart Rate Monitor Strap Features: Freediving computer Carbon fiber ring PC interface Heart rate chest strap Dive and Chrono mode Customizable with personal data Energy consumption and heartbeat indicator (tm)Powersave(tm) mode and standby function Freediving computer with carbon fiber ring, featuring PC interface and heart rate chest strap for both Dive and Chrono mode. The UP-X 1 is customizable with personal data, providing an indication of energy consumption and heartbeat. It can be easily turned off during storage. The (tm)Powersave(tm) mode, ensures that during inactivity the standby function switches on automatically. Besides the standard features of a digital watch (Hour, Date, Chrono, Timer, Alarm, Dual Time), Dive function (detachable) is available, providing deepness, dive time, water temperature and heartrate. Dive mode starts automatically at 1 m. Once on surface, it shows recovery time, all data of the previous dive and heartbeat. Memory: Max up to 250 dive records. When (tm)Dive(tm) mode is OFF, switching on the Chrono, UP-X1 becomes a heart rate monitor for running, swimming and cycling sessions. The heart rate monitor belt is able to detect the freediver heartbeat in deep diving. The heart rate monitor, available on UP-X1 and SP2, works with 5.3 KHz frequency. It features heart rate range from 30 to 240 BPM and heart rate alert. By connecting the UP-X 1 to your PC, you can download all the dive data in a special program that allows you to display and store all recorded info. This PC program (not available for Mac), is very easy to use and its updating is automatically available for free download (omersub.com) from time to time.