USB Wireless Optical Mouse for Laptop PC Notebook has an effective distance in further distance to allow you work freely.And it adopts advanced and optical technology, high accuracy and reliability, and supports super long working life. Wi-Fi Range: 10m Type: 2.4G Wireless DPI: 800-1200-1600DPI Powered supply: 2 x AAA battery (NOT included) Number of Buttons: 3 'Size: 100x60x36mm Tracking Method: Optical 'Package included: 1 x Optical mouse 1 x USB Receiver (located inside of the mouse-bottom section, please take it out and plug it on your computer)