Introduction:  The development board adopts MS51FB9AE(Compatible with N76E003) chip produced by Nuvoton Technology as the main control, with optocoupler, relay, digital tube, LED light, button, RS485 and Infrared receiver as peripherals, and provides a program download interface, users can control all peripherals through the main control. The development board uses 12V DC power supply.  MS51FB9AE(Compatible with N76E003) Development board:  1. Operating Voltage: DC 12V.  2. Operating Current: 9-13MA.  3. IR remote control Working distance: 8-16 meters (receiver sensitivity: 0.5mW / m2).  4. Major equipment: 4Relay, 1LED Display.  5. Size: 80 x 65 x 138mm.  6. Weight: 76.7g.  The description of TB441 Infrared remote control:  Transmission / coding: NEC coding.  IRED: Infrared.  Wavelength: 950nm.  Power supply: DC 3V.  Working voltage: 2.2-3.4V.  Working current: 10mA.  Static current: 1uA.  Transmit power: 90 mW / sr typ..  Working distance: 8-15 meters (receiver sensitivity 0.5mW / m2).  Frequency: 38 kHz.  Battery: CR2025(Not included).  Operating temperature: +55 ~ -45 or specific specifications.  Storage temperature: -25 ~ +55 or specific specifications.  Size: 85 x 40 x 7mm.  Weight: 11g.     The description of SP485 USB to RS485 Converter:  This is Industrial grade USB TO RS485 Converter The USB driver IC is CH340E, stable performance, fully compatible with USB1.1, USB2.0, USB3.0, baud rate up to 256 kbps; The RS485 bus IC is SP485, this is Industrial grade RS485 conversion IC.  USB to RS485 serial port, 4 pin pin assignment as below: 5V GND A+ B-.  Uses: CH340 replace FT232 CP2102 PL2303 for PLC PTZ RS485 MCU etc. RS485 Bus Device.  Size: 36 x 16 x 12mm.  Weight: 8g.  Supports the following Windows OSes:  Windows 98SE.  Windows ME.  Windows 2000 SP4.  Windows XP SP2 and above (32 & 64 bit).  Windows Server 2003 (32 & 64 bit).  Windows Server 2008 / 2008 R2 (32 & 64 bit).  Windows Vista (32 & 64 bit).  Windows 7 (32 & 64 bit).  Windows 8.  Windows 8.1.  Windows 10.  Linux OS.  MAC OS.     Packing included:  1 x MS51FB9AE Development Board.  1 x SP485 USB to RS485 Converter.  1 x TB441 Infrared remote control