The Walkman Keitai W42S (Japanese: ウォークマンケータイ W42S) is a mobile phone terminal manufactured by Sony Ericsson Mobile Communications (now Sony Mobile Communications) for CDMA 1X WIN, a network brand operated by KDDI and Okinawa Cellular Telephone Company under the au brand.
It was developed as the company's first "Walkman Phone" for the Japanese domestic market.
Features The Sony Ericsson Walkman® Keitai featured 1 GB of internal storage dedicated to audio files and a 30-hour continuous playback battery life, which was the longest of any mobile phone at the time.
The device features expandable storage via commercially available Memory Stick PRO Duo cards, supporting capacities up to 4 GB. It is compatible with full-length ringtones and ATRAC3 audio files transferred using the bundled SonicStage CP music management software for PC. Additionally, the device offers a continuous music playback time of up to 30 hours.
The lower section of the device features a "Music Shuttle" controller, which is based on the Walkman Stick design. Holding down the center button launches "Shuttle Player," a dedicated software application that plays music alongside visual effects and customizable interface themes. The shuttle button can be twisted to control fast-forwarding, rewinding, and skipping tracks. Although the device utilizes a slider form factor, its music functions can be fully operated while the handset is closed.
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