... noise detectors, etc.Specification: Model EXM-12DC-D-R-V Supply Voltage 12 ~ 24 VDC ... no Data logging optional Interface 1 B-type USB ,1 Audio input/output ,1 RS232 & ... and user friendly eSmsConfig softwareØ Firmware upgrade via serial portØ Configurable filtration for digital inputsØ Relay ... off-delays, pulse relay ,counters ,Watchdog function ,PI controller etc..Ø Logic functions-AND, OR, NOT, XOR……Ø ...