Is the battery easy to replace? Yes, all you need to do is take the cap off, take a needle nose pliers and then take the battery out and put a new one in. How long does the battery last? Depends how much you use it! The battery usually lasts 4 years! How far can the light be seen? Depends on the color! The red and orange are easier to see because they are on the end of the spectrum of visible light. How does it attach to the flag? Please look on product page. Can it be used with different kinds of tip ups? Yes How much does it weigh? The Original Night Star Tip up Light weighs .9 ounces!