1. Power Knob: This knob turns the radio on and off. Pressing the knob slightly or momentarily turns the radio off and then back on, effectively muting the sound. Fully pressing and holding the knob for a few seconds powers the radio off.
2. Volume Control: This knob adjusts the volume of the audio output. Turning the knob clockwise increases the volume, while turning it counterclockwise decreases the volume.
3. Seek/Tune Knob: This knob is used for seeking or tuning radio stations. When in radio mode, rotating the knob clockwise or counterclockwise will seek and play the next available station in that direction on the FM or AM band. Pressing and holding the knob allows for manual tuning of the radio station by incrementally changing the frequency.
4. Preset/Scan Knob: This knob is used to access preset radio stations or scan through stations. When in radio mode, pressing the knob will cycle through the preset stations stored in the radio's memory. You can save and access your favorite radio stations by long-pressing the corresponding preset buttons until the frequency is stored. Pressing and holding the preset/scan knob for a few seconds will enable the scan feature, which will automatically search and play available radio stations one after another.
5. Source/Mode Button: This button is used to select the audio source or mode. Pressing the button repeatedly will toggle between AM, FM, CD, and AUX (if connected). The current audio source will be displayed on the radio's screen.
6. Tone/Bass/Treble Adjustment Knobs: Depending on your specific model, the 2008 Honda Element CD radio might also feature knobs for adjusting the tone, bass, and treble levels of the audio output. These knobs allow you to customize the sound quality to your preference.
It's important to refer to the user manual or owner's guide of your specific Honda Element model for detailed information on the radio's controls and features, as there might be variations depending on the exact trim or variant of your vehicle.