Best Trackball Explorer replacement I've found

This is the best feeling trackball I have found since the MS Trackball Explorer. It's not exactly the same but it's close enough that I quickly was able to adjust. The good: -Close ergo's to the trackball explorer -Flexible configuration The bad -Battery life is terrible. I have gone through 2 sets of batteries since I bought it. I really wish I had gone with the wired option. - slight lag, but it's manageable. it may have been better with the wired version

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