The Eterna Compact 10X25 is backed by a limited lifetime warranty. This small and lightweight (12oz.) Compact is built with BaK-4 prism glass and, like all Eternas, features state-of-the-art multi-coating and twist-up eyecups with multi-step long eye relief. The Eterna Compact compares favorably against optics at twice the price and comes with BinoGlove neoprene lens covers and neck strap. Brunton is proud to offer all the features of an Eterna for those who need "big" quality in a "small" package.