Assalamu Alaikum. I bought this keyboard in May or June 2014 and it worked well until recently, when four switches stopped working properly. It can be easily repaired, but since I cannot find a good mechanic, I have decided to sell it. Whoever buys it can easily fix it at a low cost. The four keys with issues are 3, E, S, and X. The issues are: pressing 3 types 34, E types ER, S types DS, and X types XC. Apart from these four, there are no other issues. The keyboard is fully mechanical with clicky sounds and RGB lighting with 20 programmable modes. You can use it on any device once the keys are replaced. Only serious buyers contact me. The box is missing. Thank you.