These LED writing boards use an edge-lit system to illuminate hand-written presentations. The black marker boards require the use of water-based markers, which are included with every purchase. These LED writing boards flash and blink in 13 settings.These LED writing boards that flash are a very popular means of attracting the attention of passersby. The illuminated fluorescent signs are common advertisers at restaurants, bars, nightclubs and other main street attractions. The LED writing boards with edge-lighting, also known as markerboards, allow users to create their own customized message. Dining establishments use these fluorescent markerboards to display daily or nightly specials with ease. These LED writing boards that light up are a flashy and modern alternative to traditional chalkboards or whiteboards. The custom message signs communicate important information to target audience in style!These fluorescent menu signs, LED writing boards that light up are well-crafted for years of use! The illuminated displays feature 13 different flashing effects (see video below) to suit the tastes of users and potential customers. Each of the effects on these LED writing boards incorporates various combinations of small, blue, green or red LED lights. The units glow with neon colors when decorated with a custom, liquid chalk or wet-erase marker message (sold separately)! The LED writing boards include screws and wall anchors for mounting. Hanging hardware is also included, to suspend the neon signs from the ceiling! These LED writing boards feature a black, beveled frame, for a clean, attractive appearance. A small, inconspicuous button on the side of the frame quickly and easily adjusts the light effect setting. A soft cloth towel is also included with the LED writing boards for easy cleaning.Dimensions:Overall: 42-1/8w x 18-1/8h x 1dViewable Area: 38w x 14hElectrical Cord Length: Approximately 16 ft.Hanging Wire Length: Approximately 3 ft.Please Note: These flashing write-on frames include hardware for wall-mounting in both portrait and landscape format. The suspension wire will only accommodate the sign in portrait format, however.