ROYSC Silent buttons Ultra-thin 2.4GHz Wireless Rechargeable Mouse Built-in 550mAh Battery for PC Computer Notebook with Nano Receiver No needs for additional batteries. Build-in rechargeable battery. 2.4 GHz wireless provides a powerful, 3DPI switch ( 800, 1200, 1600) to change the speed of mouse freelyreliable connection. Nano-receiver stays in your PC USB port or stows conveniently inside the wireless mouse when not in use. Smooth, precise and affordable wireless optical 4-button mouse. Ultra slim and lightweight design,Perfect for putting in your laptop bag or pockets and taking it for travel. 3 DPI adjustable levels to suit both ordinary and gaming needs. Optical laser allows for quick response, precise movement, and smoother tracking. Works with Windows XP, Vista, 7, 8, 8.1,10 and Mac OS