Now one of our most popular keyboards comes bundled with a optical 2 button scroll mouse. The E03601QUS201-C, PS2 keyboard, which features a large L shape Enter key and all the Windows application keys. Comes with the color matching optical 2 button PS2 scroll mouse which is easy to use and great for the internet and software packages. Bundling these 2 products into one convenient package and youve got a great combination. The E03601P1M and E03601P2M keyboard bundle meets the European Union RoHS initiatives. The keyboard features the Key Tronic patented 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.