• Screen size: 3.5 inches
• Screen resolution: 320 by 480 at 160 ppi
• Input method: Multi-touch
• Operating system: OS X
• Storage: 4GB or 8GB
• GSM: Quad-band (MHz: 850, 900, 1800, 1900)
• Wireless data: Wi-Fi (802.11b/g) + EDGE + Bluetooth 2.0
• Camera: 2.0 megapixels
• Battery: Up to 5 hours Talk / Video / Browsing – Up to 16 hours Audio playback
• Dimensions: 4.5 x 2.4 x 0.46 inches / 115 x 61 x 11.6mm
• Weight: 4.8 ounces / 135 grams

Source: Apple Inc.