Dernen Programmable Rechargeable LED Digital Scrolling Message Name Tag ID Badge (12x48 Pixels) (Green) Store up to 8 different messages, 2 logos, and 2000 Characters 8 Display Effects (Scroll, Snow, Flash, Hold,Left,Right,Up,Down), 6 Level Speed, 11 animated emoticons Adjustable Brightness (25%, 50%, 75%, 100%) Pins to your shirt or with powerful magnet Programmable through your PC on XP, Vista, Windows 7 and Windows 8. Not available for Mac. Rechargeable battery or run through AC.