Sony Digital Professional Flash Voice Recorder With 4GB Internal Flash Memory, Up To 1,073 Hours Of Maximum Recording Time, Easy-To-Use File Transfer Capability To PC/Mac, Memory Card Expansion Slot, Scene Select, Intelligent Noise Cut For Noise-Free Recordings, "Batteries Included" Built-in 4GB flash memory Up to 1,073 hours of maximum recording time Easy-to-use file transfer capability to PC/Mac Memory card expansion slot Scene Select - Intelligent Noise Cut for noise-free recordings