Programed to flash back and forth making a realistic rail road crossing sign

Designed using authentic LEGO® pieces, this rail road crossing sign has realistic flashing LEDs already installed.  Choose between USB or 9-volt battery to power the sign.  About 12 inches of wire is included.

What is the difference between USB and Battery power?

USB Plug:

  • The usb plug must remain plugged into a power source
  • To turn lights on and off you simply plug in or unplug
  • Potential power sources include, cell phone power bank, USB wall plug, Computer USB port

 9-volt battery:

  • 9-volt battery required (not included)
  • Push button on the top to turn lights on and off