Handshake Mouse Wireless VS4A basic vertical mouse model for left- and right handers.If you would like to have a vertical ergonomic mouse shape, and a short time to become familiar with using a vertical mouse model, then the Handshake Mouse is the best mouse model for you. It has two mouse buttons, a scroll-wheel, and adjustable DPI-values. With the Handshake Mouse you can work with a neutral positioning of your arm and wrist, and physical discomfort can be prevented. Start working in a more relaxed and productive way.