Size and weight Height: 4.5 inches (115 mm) Width: 2.4 inches (61 mm) Depth: 0.46 inch (11.6 mm) Weight: 4.8 ounces (135 grams) Capacity 4GB or 8GB flash drive1 Display 3.5-inch (diagonal) widescreen multi-touch display 480-by-320-pixel resolution at 160 dpi Support for display of multiple languages and characters simultaneously Operating system OS X GSM Quad-band (850, 900, 1800, 1900 MHz) Wireless data Wi-Fi (802.11b/g) EDGE Bluetooth 2.0+EDR Camera 2.0 megapixels Audio Frequency response: 20Hz to 20,000Hz Audio formats supported: AAC, Protected AAC, MP3, MP3 VBR, Audible (formats 1, 2, and 3), Apple Lossless, AIFF, and WAV Video Video formats supported: H.264 video, up to 1.5 Mbps, 640 by 480 pixels, 30 frames per second, Low-Complexity version of the H.264 Baseline Profile with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; H.264 video, up to 768 Kbps, 320 by 240 pixels, 30 frames per second, Baseline Profile up to Level 1.3 with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; MPEG-4 video, up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats Headphones Stereo earphones with built-in microphone Frequency response: 20Hz to 20,000Hz Impedance: 32 ohms Mac system requirements Mac computer with USB 2.0 port Mac OS X v10.4.10 or later iTunes 7.3 or later Windows system requirements PC with USB 2.0 port Windows Vista Home Premium, Business, Enterprise, or Ultimate Edition; or Windows XP Home or Professional with Service Pack 2 or later iTunes 7.3 or later Environmental requirements Operating temperature: 32° to 95° F (0° to 35° C) Nonoperating temperature: -4° to 113° F (-20° to 45° C) Relative humidity: 5% to 95% noncondensing Maximum operating altitude: 10,000 feet (3000 m) Input and output iPhone 30-pin dock connector 3.5-mm stereo headphone minijack iPhone Dock Dock connector Power and battery Built-in rechargeable lithium ion battery Talk time: Up to 8 hours2 Standby time: Up to 250 hours3 Internet use: Up to 6 hours4 Video playback: Up to 7 hours5 Audio playback: Up to 24 hours6