Fast Flashing 2.5 Hz 3mm Square LEDs Our bulb LEDs now come with none of the extra plastic! These mini LEDs are small enough to fit into the tightest spots in your layout and are just as bright as our other lights. At 3.2 mm by 4.4 mm by 2.1 mm, these small LED lights are technically more rectangular, but they give a very modern, square look! Available in various voltages, these trim and small battery operated LED lights can also be ordered in solid and fast flash. The square LEDs are very popular with our diecast customers because of their ability to fit into tight spaces, the exceptional amount of light they give off, and the variety of colors and voltages we have in stock. Get these same LEDs in solid: Solid 3mm Square LEDs "What do I need to run these?" 3 volt use Our 3 volt coin holder with switch 3 volt AAA holder with switch 3 volt AA holder with switch or our 3 Volt Adapter 5-12 volt battery / regulated adapter Your own battery, or for 9 volt get our 9 volt battery snap/switch or plug in 12 volt get our 12 volt regulated adapter Your own AC/DC or DCC supply: 7-19V 7-19 volt Universal AC/DC/DCC lights are already set up "plug and play" for your own power supply All of our LEDs come with a 2 year warranty!