This document introduces the main features and performance of a certain brand of watch, including sports modes, heart rate monitoring, sleep monitoring, blood oxygen monitoring, and stress monitoring.
This manual provides step‑by‑step instructions for using the Wonder WD‑2903 MP3 player, including basic functions such as playback, volume control, lyric sync, recording, radio, and system settings. It also details safety notices, warranty information, and how to connect the device to a PC via USB.
Additional sections cover firmware updates, troubleshooting, and a full list of technical specifications such as battery type, memory capacity, and USB transfer speed. This manual is written in Chinese.
| Battery type | AAA alkaline battery |
|---|---|
| Maximum playback time | 10 hours |
| Flash memory capacity | 128 M–1 G (model dependent) |
| USB transfer speed | High‑speed USB 1.1 (read 1000 KB/s, write 800 KB/s) |
| Headphone output power | 5 mW per channel |