Feature: 1. Ergonomic Design: Ergonomic vertical design reduces wrist strain and improves work efficiency, making this mouse perfect for long hours of use. 2. Multi Connectivity: Easily connect to multiple devices using either USB or 2.4G wireless technology, making it versatile and convenient for a variety of circumstances. 3. Multi Function Button: Benefiting from the multi function button design, users can customize button settings for quick and convenient operation. 4. Comfort Holding: The mouse is designed to fit the curve of your hand, light in weight, reducing fatigue even after long periods of use. 5. Power Saving: Built in 500mAh rechargeable battery, this wireless mouse saves you from the hassle and cost of constantly changing batteries. Specification: Item Type: Vertical Mouse Material: Plastic Battery: 500mAh Lithium battery Receiver: Inside the mouse Hardware Requirements: Support PC computers with USB port Applicable System: for WINDOWS XP NT 3.X VISTA, for WIN7 DPI: 1000-1600-2400. Package List: 1 x Vertical Mouse1 x Receiver1 x Manual1 x USB Cable