Led Name Badge,Led name card,Led name display,led Badge,Led message badge,with Battery work over 30 hours ,different color ... 17(mm) Matrix: 21 x 7 Number of LED: 147 Feature: Can store 6 messages(1 can ... characters, 2-6 can store 256 characters) With 9 levels of speed to display, and 9 ... LED color: red, blue, green, yellow, white, pink, three colors mixed Operation time: about 20 hours Led Name Badge