Volume and playback at a glance Volume control: Increase or decrease the volume by turning the knob. Power control: Turn the lever clockwise to turn on; turn the lever counterclockwise to shut down. Playback control: Previous song by doubleclicking the knob; Next song by singleclicking the knob. Audio sources and switching: Audio sources include Bluetooth, TF card, FM, and AUX. To switch sources, press the M key to cycle through. Key benefits Simple, intuitive operation with a single knob for volume and playback adjustments. Flexible compatibility with multiple audio sources for versatile use. Quick source switching and tactile controls reduce distractions and improve user experience. Use scenarios In car or on the go: Use the knob to adjust volume and skip or go back tracks while driving or commuting; cycle audio sources with the M key to match your device. At a desk or in a living space: Stream via Bluetooth or play from a TF card; easily navigate tracks without reaching for multiple buttons. Outdoors or during workouts: Connect via Bluetooth or AUX, switch between Bluetooth, TF card, FM, and AUX as needed, and control playback with a single control knob.