I purchased logitech k400 keyboard today. The build quality of the product is really poor. The plastic used is truly substandard. You need to press the keys really hard to register it. The thing which is completely unusable on the keyboard is the scroll by touchpad. It scrolls down like 5 pages in one little scroll. There is no control in logi options app to control scroll speed. I purchased it from logitech showroom in nehru place and they don't accept any returns. If you can please accept this as return. It is completely useless for me.