When you choose from the Key Tronic E03600P family of keyboards with Windows keys, you get a variety of optional features. They are designed for the Microsoft Windows operating system, featuring left and right Windows keys and an application key. The E03600P keyboard meets the European Union RoHS initiatives. Now shipping with Ergo Technology. Most keyboards use a standard 55 grams of force required to register every key, Ergo Technology has 5 different levels of force. From 35 grams to 80 grams - that correspond to the strength of the finger that touches the keys. The result is more comfort for your hands.