case: metal case, screwless design Memory: 4 GB, option 8 GB Interface: USB 2.0 Earphone-connector: 3.5 mm phone jack Display: LCD, 1.8 inch, 64K colours, 128 x 160 pixel earphones: Sennheiser brand MX500 or equal operating temperature: 5 to 40 centigrade storage temperature: -20 to 45 centigrade accu: Li-polymer, high capacity (up to 14 hrs. play-time or better) charger - power adaptor: Input 100-240V AC; 50/60Hz; 0.15A   Output 5.0V DC; 0.7 A  cable 1.8 m, Mini-USB-connector file format audio: .mp3; .wav; .wma (DRM 9&10 support)  Accessories: - USB 2.0 - cable 1.8 m - soft leather case - lanyard - manual, A5-size (40 pages, 11 languages) warranty: 40 months OPTION 1: FM-tuner, other features same as above  OPTION 2: same as above, but MPEG-4 configuration; file format: .wmv, .avi; w/ video conversion program (.mpg, .asf, .avi, mpg4, .wma, etc) OPTION 3: same as OPTION 2, but with additional FM-tuner;