Brightness is not adjustable, about 2000cd. Default function is text letter, time and date;temperature function is for option 5. 75cm x 25cm x 9cm (29.53in x 9.84in x 3.54in).The item "26X8 inch indoor full color LED display scrolling text sign aluminum billboard" is in sale since Friday, May 11, 2018. This item is in the category "Business & Industrial\Retail & Services\Business Signs". The seller is "galaxygo" and is located in HK. This item can be shipped worldwide.