Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Turnning Peltor Tactical Sport "on" or "off'

I have not used my Peltor Tactical Sport noise cancelling earphones for some time. After replacing the bateries, I don't remember how to turn the device on or off! There is a small rubber embosed on/off symbol on the side of one of the ear pieces adjacent to the volune plus and minus buttons. Pressing that (on/off) button seems to do nothing. There is no indicator like a light nor is there any apparent change in the sounds heard through the ear phones. I can't tell if I turned it on or off. I need some help. Incidentally, my Peltor model does not look like the current illustrations of the product. I probably have an earlier model.