ICD PX333 Digital Voice Recorder
This device from Sony offers a pretty standard 4 GB of memory but it does include an expandable slot for increased capacity of up to four times more storage space. The ICD-PX333 records in MP3 and you can adjust the resolution quality at up to 192 kbps bitrate. The device is capable of over 1,000 hours of record time with your choice of input sources; either the integrated monaural microphone with sensitivity adjust or try the input jack to use any other stereo microphone of your choice.
This unit also offers Sony's noise reduction technology to minimize ambient sound and a recording mode adjust to optimize your settings according to what you're trying to record and where you're trying to record it. Playback is easy with an included USB port to transfer your files to any PC or Mac, or just listen through a pair of headphones.