These amazing LEDs contain a blue chip and an on-board controller that flashes the LED so fast that the LEDs look like a solid blue LED. However, wave them around and you magically see a dashed ribbon effect due to persistence of vision, as in the photo.
These are a standard 5mm LED package and can be treated as a standard 5mm LED. Max Vf is 6 volts, and while you should use them with a resistor, it is recommended to keep the supply voltage below 6 volts.
Image is representative only.