Desktop Programmable Scrolling SMD Dot Matrix LED Mini Display (16x64 pixels, 1.85 pitch) Blue Store up to 6 different messages, 2 logos, and up to 1500 characters. Dimensions: 7 x 2.1 x 0.6 inches Program available through included disk only; Rechargeable battery or run through AC. Programmable through your PC on XP, Vista, Windows 7, or Windows 8. Not available for Mac Number of English characters not moving: 8; Charging time: 2-3h; Working time at 25% brightness: 12h Material type: aluminum alloy and plastic; Adjustable Brightness (25%, 50%, 75%, 100%) 4 Display Effects (Scroll, Snow, Flash, Hold) 5 Level Speed, 11 animated emoticons