1. Very stylish, affordable and packed with great extras E100 comes with built-in a pair of Stereo Speaker, Micro SD Slot, new D-Click System, Line-In Recording (Internal MIC and External MIC Support), 262K Color 2.4” TFT LCD with colorful GUI, FM Radio with recording, Voice Recording, Photo Viewer, and Text Viewer. It natively supports MP3, WAV, WMA, OGG and FLAC audio file formats and MPEG-4, WMV9 and XviD video file formats featuring video bookmarking, sequential playback option. 2. Intuitive iriver New D-Click System E100 provides comfortable usage with ‘iriver new D-Click System,’ which is operated by clicking the housed menu button in the four directions with square middle OK button easily and satisfyingly clickable. UI (User Interface) is intuitive and easy to control. Take pleasure in the new D-Click System. 3. Simple, Stylish, and Durable Design E100, with rounded corners and a clean face, is smooth, durable, and resistant to fingerprints and scratches. Its’ compact size and weight still lives up to iriver's usual standards of quality portable Audio/Video player. . Music Files - E100 supports most popular audio formats MP3, WAV, WMA, and OGG and FLAC – both lossless file formats. Providing abundant base and three-dimensional sounds with playback featuring A-B repeat, play modes (normal, repeat, repeat one, shuffle, shuffle + repeat), presets EQs (normal, rock, pop, classic, soft, jazz), a 5-band custom EQ, SRS WOW HD audio enhancements (SRS, TruBass, Focus, WOW, Definition), fade-in, scan speeds, ratings, and bookmarks . Video files - E100 with TFT LCD (320 X 240) resolution supports Xvid, MPEG-4 SP and WMV9 SP of 30 frames per second. . Line-In Recording (Internal MIC and External MIC Support) . Built-in Stereo Speakers . Covered Micro SD card slot supporting cards up to 4GB in size.