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 MouseMaterial: PlasticBattery: 500mAh Lithium batteryReceiver: Inside the mouseHardware Requirements: Support PC computers with USB portApplicable System: for WINDOWS XP NT 3.X VISTA, for WIN7DPI: 1000-1600-2400.Package List:1 x Vertical Mouse1 x Receiver1 x Manual1 x USB Cable