Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Comfortably unusable

This major problem with this keyboard is the receiver. It's comfortable to type on, until you have to fix the constant series of mistakes. Other reviewers mentioned how wonky the spacebar is, I can confirm that. It also has the "keyboard rubberband effect" where nothing will appear momentarily then the wireless signal will stop lagging and a string of jibberish/connected words will appear. The spacebar and keyboard rubberbanding make it unusable. It is worth noting I have the reciever on top of my desk as opposed to the back of the computer. Any position on the machine or attached to a powered HUB makes no difference, and the problem still appears.The mouse works, but it's like holding a brick. I can confirm this after some experiments with this mouse and a brick. Either that, or it's my dainty little lady hands.