Pack of 3 ContempoViews Waveshare FT232 USB UART Board (mini): USB TO UART Solution with USB Micro Connector Original FT232RL onboard Supports Mac, Linux, Android, WinCE, Windows 7/8/8.1/10 Original FT232RL onboard Supports Mac, Linux, Android, WinCE, Windows 7/8/8.1/10... 3 power mode : 5V output, 3.3V output, or powered by target board (3.3V-5V) 3 LEDs: TXD LED, RXD LED, POWER LED