Logitech Wireless Mouse M310 (Blue Shards) Full-size wireless mouse in seven juicy colors and handcrafted patterns Contoured shape with soft rubber grips feels good in either hand Plug-and-forget Nano-receiver stays in your USB port so your mouse is always ready to use 2.4 GHz wireless connection to your Windows PC or Mac Delivers up to 12 months of power without battery changes (Battery life may vary based on user and computing conditions)