The built-in rumble motors will not activate without the proprietary driver.
Unplug your UCOM USB joystick from the computer. ucom uc js704s2 usb joystick driver win 7 download link
Dedicated control panels allow you to calibrate or swap buttons outside of standard game menus. Where to Download the UCOM UC-JS704S2 Driver The built-in rumble motors will not activate without