Ultra compact and light: 81 mm in length, 14.6 mm thick, and weighing 45 g, including the provided rechargeable battery. As unnoticeable in one's breast pocket as a lighter. This type of flash-based audio player does not require software installation by users. The developers chose a design that embodies these advantages. An uninterrupted surface of aluminum gives the unit character. The NW-E3 has 96 MB of flash memory, enough to record up to 180 minutes.