The Delton Ergonomic 12 Vertical mouse uses science-driven design that combines comfort and common sense to deliver high-end performance. Based on the 10+ years of feedback we ve gotten from you, we ve built the 12 Series with a soft-to-touch surface, intuitive button placement, easy-to-adjust precision, and best-in-class power efficiency. Get rid of the strain on your hands with a mouse that keeps you productive and pain-free thanks to more natural hand position while working. The vertical hand position reduces strain on your hand and wrist, eliminates pinch points, and reduces muscle and nerve stress.