4 Buttons: Customize Lifts 4 easy-to-reach buttons to your favorite shortcuts using simple Logi options software Fast Connection: Fast Bluetooth connection, whether you use Bluetooth low energy or the included Logi Bolt USB receiver Bundle Includes: Logitech Lift Vertical Wireless Ergonomic Mouse with 4 Customizable Buttons (Pale Gray) and Knox Gear 4-Port USB 3.0 Hub Best Fit: Lifts organic silhouette fits small to medium hands like a glove, specially designed and sculpted by Logitechs team of ergonomic and design experts Optimal Angle: Lifts optimal 57 degree angle places you in what we like to call the natural handshake position. This puts less pressure on your wrist throughout the day