4-inch (diagonal) widescreen display with Multi-Touch IPS technology Retina display 1136-by-640-pixel resolution at 326 pixels per inch 800:1 contrast ratio (typical) 500 cd/m2 max brightness (typical) Fingerprint-resistant oleophobic coating Built-in rechargeable lithium-ion battery Music playback time: Up to 40 hours when fully charged Video playback time: Up to 8 hours when fully charged Charging times: Fast charge in about 2 hours (80% capacity), full charge in about 4 hours Three-axis gyro Accelerometer Apple EarPods Frequency response: 20Hz to 20,000Hz 802.11a/b/g/n Wi-Fi (802.11n 2.4GHz and 5GHz) Bluetooth 4.0 Maps: Location-based service Nike+ support built in