I never thought buttons on either side of the mouse wheel would be so useful. Now I can't imagine using a mouse without it. (More about the key binds in the comments) :
Logitech M650 Wireless Mice - Small, Large, Left Handed Mouse
Does anyone know of other mice with 4 side buttons similar to this? : r/MouseReview
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Logitech® M510 Wireless Mouse, Three Buttons, Silver LOG910001822
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Put Your Extra Mouse Buttons to Use in SOLIDWORKS!
Amazon.com: Logitech Signature M650 L Left Wireless Mouse - For Large Sized Left Hands, 2-Year Battery, Silent Clicks, Customizable Side Buttons, Bluetooth, for PC/Mac/Multi-Device/Chromebook - Graphite
Amazon.com: Logitech G600 MMO Gaming Mouse, RGB Backlit, 20 Programmable Buttons, Black : Video Games
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Logitech G602 Wireless Optical 11-Button Scrolling Gaming Mouse Black 910-003820 - Best Buy