The RTR-500/RTR500B series allows you to mix and match an array of wireless radio communication loggers with various data collectors to meet your needs. The RTR500BM is a data collector equipped with 4G mobile network capability. It collects data from nearby data loggers via wireless radio communication and then automatically sends it via 4G cell phone networking* to the free cloud storage service "T&D WebStorage Service" for anytime anywhere access. The RTR500BM also has a warning monitoring function that sends a warning e-mail via T&D WebStorage Service and/or SMS when a set limit is exceeded. It is perfect for situations where you have no PC or LAN available, such as during transportation, in greenhouses or at construction sites. As long as you can supply power, you can collect and transfer data without worry and stress. *A SIM card is required. Some carriers in the US are not supported and cannot be used with the RTR500BM. Please contact T&D distributor for details. For information about carriers in other countries, contact your local T&D distributor.