EEEKit 4 in 1 Kit for Microsoft Surface Pro 4/Pro 3, Carry Case Briefcase Cover Travel Bag + 3 Port Hub + 2.4G Wireless Optical Mouse + 5 mm in-Ear Earphone Kit covers your most essential Surface Pro 4 needs. Bag Interior size: 12.59*8.86 inch(32*22.5cm), Exterior size: 13.58 *10.04 inch(34.5*25.5cm). Horizontal Design With Handle Fits, Zipper Design, Cotton Material. The 2.4G wireless optical mouses are universal, supporting all desktops and laptops with USB port. The hub with rotated 180 degree design allows simultaneous operation of up to 3 separate devices all attached to a single USB port. Buy from sellers EEEKit or Amazon to ensure authenticity and better service.