You have to say the same in advance: Well, it looks out, the solar keyboard. It is only 7mm high and totally flat, feels remarkably stable and keeps hopefully also so much. Tapping is also with folded feet very pleasant. The writing experience is positive. The keyboard has an input and off switch, which is of course great. The funniest part is certainly that it is running with solar and thus no batteries are needed. In combination with the M570 Scroll Ball Mouse from Logitech I could both devices to a Unifyer (was present in the keyboard including extension) connect, in a few seconds, both devices were running properly. With the supplied cloth, the glossy surfaces allow good polish. I find it a pity that a German keyboard layout is not produced in series. However Umlabelung acts professional and neat enough to absorb to the. How long have the keys held, however, it is too early to say.