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The iPhone 4 will also sport what Jobs described as a “retina display” with four times the pixel density of a typical LCD display at a whopping 326 pixels per inch—by far denser than anything else in the consumer electronics market. The result is a 3.5-inch display with a native resolution of 960 by 640 pixels that is actually a higher resolution than the typical human eye is capable of perceiving, when held at a distance of just 10 to 12 inches. Jobs claims the iPhone 4’s display winds up looking like a high quality printed book (albeit that emits light!) rather than a blocky pixellated grid. The iPhone OS automatically handles rendering text and controls at the higher resolution for the iPhone 4, so developers don’t need to do anything to update their applications to look good on the new display but, of course, if developers want to add higher-resolution graphics to their apps, they will look stunning on the iPhone 4.

The iPhone 4 will also feature an Apple-designed A4 CPU, following along the lines of the processor powering the iPad. Jobs said the A4 processor improved power management, so the iPhone 4 will manage 40 percent more talk time on 3G networks (up to 7 hours), or up to 6 hours of 3G Web browsing or 10 hours of Wi-Fi browsing. The device can also play up to 10 hours of video, 40 hours of music, and should have an standby time of up to 300 hours.

Size and weight

Height: 4.5 inches (115.2 mm)

Width: 2.31 inches (58.6 mm)

Depth: 0.37 inch (9.3 mm)

Weight: 4.8 ounces (137 grams)

Capacity

32GB

Camera, photos, and video

Video recording, HD (720p) up to 30 frames per second with audio

5-megapixel still camera

VGA-quality photos and video at up to 30 frames per second with the front camera

Tap to focus video or still images

LED flash

Photo and video geotagging

Cellular and wireless

UMTS/HSDPA/HSUPA (850, 900, 1900, 2100 MHz)

GSM/EDGE (850, 900, 1800, 1900 MHz)

802.11b/g/n Wi-Fi (802.11n 2.4GHz only)

Bluetooth 2.1 + EDR wireless technology

Display

Retina display

3.5-inch (diagonal) widescreen Multi-Touch display

960-by-640-pixel resolution at 326 ppi

800:1 contrast ratio (typical)

Fingerprint-resistant oleophobic coating on front and back

Support for display of multiple languages and characters simultaneously

Sensors

Three-axis gyro

Accelerometer

Proximity sensor

Ambient light sensor

Location

Assisted GPS

Digital compass

Wi-Fi

Cellular

Power and battery

Built-in rechargeable lithium-ion battery

Charging via USB to computer system or power adapter

Talk time:

Up to 7 hours on 3G

Up to 14 hours on 2G

Standby time: Up to 300 hours

Internet use:

Up to 6 hours on 3G

Up to 10 hours on Wi-Fi

Video playback: Up to 10 hours

Audio playback: Up to 40 hours

Audio playback

Frequency response: 20Hz to 20,000Hz

Audio formats supported: AAC (8 to 320 Kbps), Protected AAC (from iTunes Store), HE-AAC, MP3 (8 to 320 Kbps), MP3 VBR, Audible (formats 2, 3, 4, Audible Enhanced Audio, AAX, and AAX+), Apple Lossless, AIFF, and WAV

User-configurable maximum volume limit

Mac system requirements

Mac computer with USB 2.0 port

Mac OS X v10.5.8 or later

iTunes 9.2 or later 

iTunes Store account

Internet access

Windows system requirements

PC with USB 2.0 port

Windows 7; Windows Vista; or Windows XP Home or Professional with Service Pack 3 or later

iTunes 9.2 or later

iTunes Store account

Internet access

Environmental requirements

Operating temperature: 32° to 95° F (0° to 35° C)

Non operating temperature: -4° to 113° F (-20° to 45° C)

Relative humidity: 5% to 95% noncondensing

Maximum operating altitude: 10,000 feet (3000 m)