Raspberry Pi 3 GPIO-232 Multifunction Expansion Board with LED Nixie Tube with 485 232 UART Keys for Raspberry Pi 3B+ / 3 / 2
Specification:
1. The RS485 module
2.The RS232 module(green DB9)
3.EEPROM (24 c16)
4.Three leds
5.Three buttons
6.A buzzer
7.4 in 1 digital tube
8.The rest of the IO mouth raises
9.TF card module (SPI)