Covington 7 sultans mobile We guarantee the best quality channel letters and on -time delivery.Our channel letters are manufactured with the latest computerized equipment and this brings sharpness to the letters and ensures a high quality product. All our signs are approved by UL. We believe in the durability of our products and ensure it through a five year warranty. Our motto is a 100% satisfaction for our customers. We create high quality signs that can ensure a repeat customer for your retail business.