This is a junk item and is defective. There is a problem where the pressed keys get stuck. I opened the lid once and inspected it, but the cause was unknown. Sometimes it returns to normal when the body is twisted. When it's working properly, the LED lights up and key input works without any problems. Please consider it for parts or repair. From a quick glance, the WSAD keys are worn. Also, since it is a used item, there are signs of use and scratches, so please understand.