The instrument is available in two versions:
Standard version/Self-recording is instrument with internal data storage and battery power.
Real-time version can be used with internal data storage and battery power and/or with cable to shore with real-time data connection and external power.
The Real-time/high power version has a slightly higher power consumption due to the voltage regulation of the input power. If the instrument is only to be used as a self-recording instrument we recomend the standard version.