Simply connect Panasonic Datalogger unit (DLU) to target equipment to collect and log data. Realize numerous applications, such as measuring energy consumption in buildings, remote temperature control of facilities, monitoring operation log data of production lines. Equipment, facilities, and service networks for data collection/logging, data transfer via e-mail/website, and system streamlining can be established without special knowledge. Simply connecting the unit to the target equipment allows data collection and logging to measure, for example, energy consumption in buildings/convenience stores. Operation data (log data of production quantity, errors, etc.) of each production line or floor of the factory can be remotely monitored and collected.