The EDR-3C is a portable impact, shock and vibration logger, recorder and detector combo unit and has a built-in triaxial accelerometer that's designed to measure shock, vibration, temperature and (as an option) humidity, pressure, or resistance-bridge devices. The programmable unit tags all acceleration events with a time and date to provide a time history of the dynamic environment experienced during a recording session. The EDR-3C series impact, shock and vibration combo recorders offer you a time-tested reputation for proven performance and reliability with hundreds of successful installations since 1989. The EDR-3C series operates similarly and differs only in programmability features, on-board memory and channel capacities. Each impact, shock and vibration combo recorder is powered by a specially designed C-Cell battery pack (9 Volt optional.) The EDR-3C impact, shock and vibration combo recorder is used in conjunction with DynaMax programs and downloads the EDR-3C's memory via an IBM compatible personal computer using serial & USB. Together, the EDR-3C and the DynaMax software program provide a powerful tool for accurately recording and analyzing dynamic environments.