Aiben C5S radio user manual in English.

1. Before first use fully charge the lithium battery.

2. Power On/Off: Press and hold the power button for more than 3 seconds to turn on the device, then press and hold the button again to turn off the device.

3. Automatic search for stations: With the device turned on, press and hold the “M+” button for 3 seconds to automatically search for radio stations (50-108 MHz) and save all found stations. After the search is completed, the first station will be switched on. Press the “M+” button again to play the next station. While searching for frequencies, the message 自动搜台 (“Automatic search for stations”) will be displayed on the screen.

4. Manual search for stations: press and hold the “▶” button to search up the frequency; Press and hold the "◀" button to automatically search downward in frequency. The system will automatically stop when it finds a station. When searching for a frequency, the message 自动搜台 (“Searching for stations automatically”) will appear on the screen.

5. Fine tuning: Short press "▶" or "◀" key to fine tune the frequency up or down.

6. Volume adjustment: Short press the “+” or “-” button to increase or decrease the volume.

7. Access your favorite radio station: tune to the desired frequency, press and hold the "CET" button to save the current station. When you save a station again, the system will automatically overwrite the previous station. Short press the “CET” button to read the stored station. When accessing a station, the screen will display 校园台 (“Campus Station”).

8. Stereo/Mono switching: Long press "-" key, the screen will display 立体声 (Stereo), long press "-" again to switch to mono mode.

9. Keyboard Lock: Press and hold the "+" key, the screen will display "⚷", lock the keyboard, press and hold again to unlock it.

10. Clock: 1. Clock display: When the device is off or on, short press the power button to display the time. 2. Clock Setting: When the device is turned off and the clock is displayed, press and hold the “◀” button to make the hour digits flash. Pressing the “◀” button again briefly starts the minute digits to blink. While the numbers are flashing, briefly press the “+” or “-” button to set the clock.

Source: http://aiben.cn