Inskrib Smart Bluetooth LED Sign RED, Runs with Free iOS or Android App, Small Businesses, Pop-up Tents, Bars, Etc. Easiest LED sign in the world Uses Free iOS and Android Apps, see it in action here: www.inskrib.com Up to 99 messages, easily changed, count-down and clock features too! Rechargeable internal battery that lasts over 6 hours Runs on AC power as well