The original, immediately when the transmitter was installed, the logitech software was installed, keys are very quiet (in any case as long as it is new). There's also a mouse without a problem touching Bluetooth, no loss of contact, but if the laptop fell asleep, the mouse can no longer wake up because Bluetooth is also disconnected. The re-connection occurs with the fly after the laptop has been awakened. I'll mark a really unpleasant plastic from a minute, And that is the lower part of soft touch plate, or some abrasive dust. Which is tactically not very pleasant. the upper part and the keys are made of a sufficiently low-cost plastic, That's why subjectively I didn't like the appearance.