The original Apple iPod (Scroll Wheel) revolutionized the portable MP3 player market by integrating a small hard drive, a unique "Scroll Wheel" for easy one-handed control, a simple Pixo OS 2.1-based operating system designed for mobile use, and sleek Mac software—iTunes (based on SoundJam)—that simplified music management between the Mac and the iPod.
The original iPod featured a 5 GB hard drive (a 10 GB option became available after March 21, 2002) capable of holding 1000 songs (or 2000 on the 10 GB model) in 160-Kbps MP3 format. It included a high-output 60-mW amplifier, a FireWire port, and a standard 3.5-mm headphone jack, all housed in an elegant "iBook white" and stainless steel case with a 2-inch white backlit LCD display. The estimated battery life was 10 hours.