DS B1 ergonomic design to enhance the comfort of the user while using mouse and to help prevent serious injury from long-term daily computer use. Featuring side anti-slip grips, ensure the prefect grip and you never loss of mouse control again. DS B1 comes with eight 2 gram weights to suit variety of games. Customize the perfect weight for a perfect feel. Gold-plated USB connector with rubber sheathed cable. High speed motion detection at 37ips and acceleration up to 15g. Resolution up to 1,600. Frame rate up to 4,000fps.