NYKKOLA Mice Ultra-Slim Mini USB 2.4GHz Wireless Mouse Optical for PC Mac Laptop Desktop Black Compatible with Windows XP or above Powered by 2xAAA battery (not included) ,ON/OFF switch Automatically power saving. Stable Connection - 2.4 GHz wireless provides a powerful, reliable connection up to 10m Smooth,Sensitive Mouse Click with Less Noise NYKKOLA is a registered trademark stands for quality,ONLY Authorized seller can sell under NYKKOLA listings.