Novastar LED Display Accessories MFN300 Multifunction CardNova M3 MFN300 is a multifunction card with a variety of auxiliary functions. Multifunction Card MFN300 Description: 8 power switch management. 4 light sensor ambient temperature sensor interface. Auto power control of fan air condition LED display based temperature. Audio output integrated. Certification: CE, RoHS. 1) RS232 serial or Gigabit Ethernet port communication; 2) Ethernet port connection between two receiving cards or at the end; 3) Timer