There is a stereo directional condenser microphone, as well as a center omni-directional microphone, which are capable of picking up clear bass tones. The 4GB memory of the DM-620 gives you the ability to record over a thousand hours of audio, and is expandable with the microSD card slot. You can transport audio files with the DM-620's USB 2.0 interface, and the battery will charge while connected to a computer. Released at the same time as the DM-620 is the lower-cost VN-801PC voice recorder, which has only 2GB of space, has no microSD card slot, lacks WAV recording capability, and has lower quality microphones.