The DigiTrail Sign is a digital trailer sign solution, and is the most reliable and easy-to-update trailer sign in the market. No need for bulky controllers or having to stand next to the sign to update it. With our GSM technology, you can update your sign from anywhere in the world; securely and reliably. Our DigiTrail Sign also features auto-dimming, lockable display and trailer, powder-coating and P20 modules; the highest resolution message board in the market. For more info: http://technosignz.ca/digitrail-sign