Both the olympus dm420 dm520 are packaged with ni mh rechargable batteries there are two ways to charge the batteries ac adapter the olympus ac adapter a 514 can be used to charge the batteries please keep in mind the a 514 is not packaged in the box. View and download olympus dm 420 user manual online olympus digital voice recorder audible user guide dm 420 voice recorder pdf manual download also for dm 450 dm 520 dm 550. Media besides the 4gb dm 520 or 2gb dm 420 built in memory you can also record onto a commercially available microsd card p 22 check the olympus website regarding microsd cards which are confirmed operation with this recorder s you can playback wav wma and mp3 format files transferred from a computer in addition to files. Olympus dm 420 digital voice recorder combo manuals manuals and user guides for olympus dm 420 digital voice recorder combo we have 6 olympus dm 420 digital voice recorder combo manuals available for free pdf download instrucoes detalhadas detailed instructions instrucciones detalladas mode demploi user manual