The product was delivered with defective batteries. Upon inquiry, I found quite a few buyers who have had this problem: the batteries are fully HS at reception or their life is more than doubtful. Needing to this keyboard, I myself have changed the batteries which probably invalidated the warranty. Other negatives, the area to ask wrist is much too small and the black matte plastic of very messy (sweaty palms refrain). Also, I sometimes lost connections while the receiver is only 30 cm from the keyboard. Pros: nice look, very pleasant touch and perfect arrangement of keys. The backlight is doing its job.
Given the relatively high price of the product, it seems to me that we should find better ...
