R4401 is a compact multi-channel system that, depending on the software configuration, can be used as a COMINT system, a COMINT system with C-ESM capability and a C-ESM system. R4401 operates over the frequency range 1-6000 MHz with an instantaneous bandwidth of up to 80 MHz. The Software Defined Radio Architecture enables the implementation of future capabilities via virtually software-only updates. R4401 has a ruggedised built to be installed and operated in harsh environments, including EW Tactical vehicles and ships. R4401 can be powered using multiple sources, including BB-2590 NATO standard batteries. The Spectrum Monitoring Suite (SMS) software application runs on all LOG.IN C-ESM and COMINT systems, including R4401.