AFGRC's Optional/Upgrade Servo PROGRAMMER is A FANTASTIC, inexpensive tool to "hone" in the exact parameters need to race and operate at full capacity! USB, Plug & Play. Requires a download from: https://www.agfrc.com/index.php? *Operating, USB Voltage: 5v/500mah, *Operating system: Windows XP/Windows Vista/Windows 8/ Windows 10 (32/64bit) * Application: AGFRC Servos with ASS Marked or Programmable Servos...