I am writing my review based on some negative reviews I have read and to clarify. This is the best flying disc I have ever thrown and I have thrown many discs in my time (note my grip). , bulletproof and changing the battery is as easy as wiping your ass. I recommend instead of replacing (2) cr2016 batteries (which can be hard to find and expensive) to buy the more common cr2032 battery, which is thicker and only requires 1 battery, not 2, and is 99ยข anywhere in most -Shops can be found , cargo ports and dollars. The tree is kept in a pack of 3-6 pieces. Just take out 2 x 2016 batteries and replace with 1 x 2032. Be careful when opening the battery case for the first time as it may be difficult to open it the first time. The button cap just pops off. The first time, you should use a spoon to remove the cap from the disk on a flat surface. I use lip balm, Vaseline, Carmex or some other product to lightly lubricate the cap to keep it watertight and always easy to open. Every once in a while the optical spikes get out of the way and cause your disc to fly incorrectly. Just put them back on the tracks and you're good to go. They shine less brightly when dirty. Alcohol on a rag cleans them well and gives them a new shine. If you have a DiscO, you will change batteries more often. Personally I prefer solid green or blue, and batteries in solid, no blinkers last 4 times longer than blinkers. For the idiots I wrote this review for because they couldn't change button batteries and preferred coil batteries (they stopped making them 15 years ago). TWISTS DO NOTHING BUT TENSE THE FIBER OPTIC NERVE CENTER. OPEN THE COVER, CHANGE BATTERIES, DROPP THE DISC. GET OUT OF YOUR MOTHER'S CELLAR AND STOP HATEING AMAZON REVIEWS AND POTENTIALLY INFLUENCE BUYERS THAT THEY MISS THE BEST FLYING ENTERTAINMENT AND EXERCISES YOU WILL ENJOY. I BUY 2 at a time, throw away every night in all conditions, and these discs last an average of 8 months to a year depending on the hits they take (they take the hits and still fly great, but the hits add up and if you throw like me every night). every year you need a new hard drive). Get out, FALL and pass.
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