Ergonomic: Promotes a neutral wrist and forearm posture Navigation: Fast and accurate cursor control Unique: Minimal learning curve Version 4 - improved grip: For thumb and pinky Version 4 - simple: Adjustable mouse speed Transmission technology: Bluetooth (no dongle included) Compatible operating system: Mac OS; only iOS compatible BakkerElkhuizen guarantees the longevity of its products. Register your product before the basic warranty expires on the manufacturer's website using the registration code or the EAN number on your product for an extended warranty of up to 5 years on electronics or even longer warranties on non-electronic products! * Extended warranties apply to all non-electronic products with the exception of all gas spring parts, which are covered by a 5-year manufacturer warranty.