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Its a lock against other buttons being pressed.
Sorry, there was a problem. Please try again later.Hi Richard, Safety Lock or Hold Function is a feature that disables all the buttons to prevent unintentional operations when you carry this unit. This explains that feature: http://docs.esupport.sony.com/voicerecorder/Help_4449569112/p33/v1/gb/contents/TP0000018510.html?search=(Hold Hope this helps. - Vincent
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