These look great and are very bright, just like the pictures. But they are not usb! They come with a wall plug and a power supply. They have a connector on both ends and can be daisy-chained together. There is no polarity key on the connectors, so you will have to try them both ways and mark + and - yourself. The power supply is not waterproof and the end connector doesn't come with a cap, so those parts must be sheltered from rain.