Emarth 2.4G Wireless Optical Mice with Double Scroll Wheel, USB Nano Receiver, 5 Buttons 1600DPI Ergonomic Design, for PC/Computer/Laptop, Grey [Plug and play]: Just plug the nano receiver, no extra driver required. DPI (1600/1200/1000dpi) button to select your preferred cursor speed. Compatible with Win 98/2000/ME/XP/Vista/7/8/10, Mac OS. [Double Scroll Wheel]: Side scroll wheel designed for faster backward & forward funtion. [2.4G WIRELESS TRANSMISSION]: A more secure and precise experience with working distance up to 10m. [Energy Saving]: Powered by 2pcs AA batteries(included), auto power-off design allows the mouse switch off automatically when the nano receiver is disconnected, the PC is switched off or the mouse is set aside. [What you get]: Emarth Grey Wireless Mouse, 2pcs AA batteries, Nano Receiver, Manual; Friendly customer service, 60-days hassle-free money back guarantee, 12 month product warranty, lifetime support guarantee.