Philips Black Digital Voice Tracer 0600 (LFH0600/00) Up to 33 hours recording time / 512 MB storage capacity (USB mass storage device) / 3 MP3 format recording modes Extra large screen provides at-a-glance overview and extra large speaker reproduces quality sound Index Mark Function  lets you mark a particular point in a recording or playback for easy retrieval Slow and fast playback  recordings can be played back at different speeds Voice activated recording  automatically records only when sound is detected, no wasted memory when operated hands free