RECHARGEABLE MOUSE With 300 mAh built-in Li-ion battery, it lasts for one month for one-hour quick recharge. No need to change batteries any more. ERGONOMIC DESIGN Say goodbye to wrist pain,Best Care of your wrist and palm. Vertical Mouse Comfortable mouse grip,alleviate wrist strain. Traditional Mouse Squeezes nerves in hang,causing pain and discomfort. 2.4G Wirele technology Lag-free wirele HIGH SENSITIVITY Easily swith between three DPI levels 1000/1600/2400 DPI Switch Button Rechargeable Wirele Mouse When charging,blue light turns on. When battery is low,red light flashes. Make sure to line up the buckle before pushing in the cable jack. ADDED SIDE BUTTON CONTROL Browse web page easily ERGONOMIC MOUSE: The vertical ergonomic design can prevent poible mouse arms or tennis elbows (RSI syndrome). Please be noted this ergonomic mouse only fits smaller hands and only for the right-handed. WIRELESS MOUSE: 2.4GHZ wirele technology provides a reliable connection and free from any interference in 360 degrees within 20 meters; the cursor is smooth, prompt and accurate. USB receiver is inserted at the bottom of the mouse. SILENT CLICKING MOUSE: With 3 adjustable DPI values: 1000-1600-2400, this vertical mouse is silent, smooth, fluent and fast response. The forward / backward side buttons can let you browse websites more conveniently. Note: forward / backward buttons do not work in MAC OS system. Two color Whats in the Package? 1 * Wirele Vertical Mouse 1 * USB Receiver (placed at the back of the mouse) 1 * USB Charging Cable 1 * User Manual When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don't hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it