FROM THE MANUFACTURER SANOXY Ergonomic Grip 2.4G Wireless Mice with Exchangeable 500/1000 DPI High-resolution. KEY FEATURES Accessory: Nano USB receiver. Switch lifespan: 5,000,000 times Effective range: up to 10 meters effective using range SANOXY 2.4G wireless mouse with 1,000DPI, working distance is 10m range. Comfortable Ergonomic Design Wireless Mouse for dailiy use, playing computer games or browsing on internet SANOXY brand has been awarded trademarks and protected by the United States Patent and Trademark Office. Exclusively marketed by authorized resellers on amazon.com in order to ensure product warranty. Package Included: 1 x Optical Wireless Mouse 1 x USB Receiver