Ergonomic designed for healthy and comfortable use.High quality optical technology for precise control.Rechargeable built-in battery will never require batteries and will be more convenient and practical for you to use.Plug and play mode, need no driver.Item Name: Vertical MouseButton : 5 ButtonsTransmission Distance: 15 MetersBattery Capacity: 400mAh (Included)Features: Wireless, Ergonomic Design, Rechargeable, Comfortable TouchSize: 101mm x 71mm x 80mm/3.98" x 2.80" x 3.15" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Vertical Mouse1 x USB Receiver1 x Charging Cable