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The Ergo M575S is Logitech's right-handed thumb trackball, an update to the M575 with a quieter click and the same sculpted shape. The ball stays put, so your hand and wrist move far less than with a conventional mouse, which is why it appeals to people with wrist strain or limited desk space. It connects over Bluetooth or the bundled USB receiver and runs about two years on one AA battery. Against the MX Ergo it gives up the adjustable tilt and rechargeable battery, but it costs less and keeps the comfortable thumb-driven layout. Reviewers rate it highly for comfort and build.
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Availability unknownSold by buy-here-inc (99.1% positive, 17,100 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.
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Availability unknownSold by jdjovanny (99.9% positive, 3,800 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.
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Lowest price we've seen: $33.98 on Nov 9 at Walmart. Tracked across 18 stores since Nov 9.
Owners rate it highly, mostly for comfort and the relief it brings to wrist and shoulder pain. Many say the transition from a regular mouse took about a week. Complaints center on the right-hand-only design and the learning curve.
