I thought there may have been a sequence pressed that may have locked buttons but didnt see it in any Q and A or in the instruction manual. Really nice. However, Sony has built them pretty flimsy. Upon receiving pillows I was doubtful if I’d made the right choice (they arrived all flattened in packaging, which initially concerned me. Same problem. Got them for my husband and he love them It doesnt smell as good. They are a little more difficult to slide on when I wear them with cotton socks. No such thing with these. Might go for the cheaper 4 pack of just metal "S" type ones instead!