Delux Health Comfort M618 Wireless Ergonomic Vertical Mouse Right Hand Optical 2.4g Upright Mouse for Computer Gaming Laptop Desktop Laser Engine Precision reasonable function layout, it is more relaxing and simple use Scientific ergonomic design, stretch the human body meridian at the greatest degree Three files adjustable laser engine, adapted to different usage situation, help you to position accurately. Key: 3 d5k + roller + DPI switching Function characteristics: 2.4G wireless laser mouse, vertical holding operation, with removable palm rest