Brunton Echo 10x26 Compact Binoculars 5058 Brunton offers a fully coated BaK-4 prism glass experience in a small, sleek package. Brunton Echo 10x26mm Compact Binoculars are introductory binoculars that stands alone as an affordable alternative in the Brunton Echo Binoculars line-up. These Brunton Binoculars come with a neck cord and a carrying case and baked by Brunton 's One-year Warranty.