: A red light indicates the device is charging. The light will turn off or change color once the speaker is fully charged (usually 3–4 hours).

Most Yayusi S2 manuals outline a similar first-time setup:

Since physical manuals are often misplaced, I have compiled a comprehensive "Quick Start Guide" and usage manual below based on the standard design and functionality of the Yayusi S2 model.

For detailed visual guides and technical support, you can visit the Yayusi S2 User Manual on Manuals+ or check official troubleshooting videos for the FM radio or alarm settings? Yayusi S2 Bluetooth Speaker User Manual - Manuals+

: Long press for 3 seconds to turn the device ON or OFF. Short press to cycle through modes: TIME > DATE > ALARM > BLUETOOTH > MP3 > LINE-IN.

Turn on the speaker. It will enter Bluetooth mode automatically, indicated by a prompt sound and a flashing blue LED. Enable Bluetooth on your mobile device and search for

: Short press the Play/Pause button. The speaker will scan all local frequencies and save them automatically.

Yes, on most models, double-clicking the or Mode button while in clock mode switches between the 12H (AM/PM) and 24H time formats. If you want to know about specific features, tell me: Does your model have a temperature display ? What specific error or issue are you experiencing? Are you trying to set dual alarms ?

When you turn on the device for the first time, it will default to clock mode.

: Plug one side of the 3.5mm audio cable into your phone or computer, and plug the other side into the speaker's AUX jack. Switch to AUX mode via the M button. 5. Screen Brightness and Display Management