The sound of the e-mark can be turned off in the App. In the 'e-mark information' on the 'e-mark connect' page, the settings can be found for switching the sound on and off. Be aware that the e-mark provides acoustic signals when e. g. an imprint is ready to be made or is indicating the end of an imprint. Without these signals you might have problems in usage. Therefore it is only recommended to switch off the e-mark sounds if you are an advanced user.