Key benefits and features Simple one knob volume control Increase or decrease volume by turning the knob for intuitive, handson adjustment. Clear playback navigation Previous song: doubleclick the knob. Next song: singleclick the knob. Easy power operation Turn the lever clockwise to turn on. Turn the lever counterclockwise to turn off. Multisource compatibility and quick switching Audio sources: Bluetooth, TF card, FM, AUX. Switch sources by clicking the M key to cycle through options. What this product solves Reduces clutter with a single control interface for volume, track selection, and source switching. Supports common playback formats and wireless connections, enabling versatile use with compatible devices. Provides a straightforward method to manage audio without navigating multiple buttons or menus. 23 use scenarios Incar or vehicle audio setup Use the lever to power the unit on or off, adjust volume with the knob, and skip tracks or switch sources (Bluetooth, TF card, FM, AUX) via simple knob clicks and M key cycling. Home or office Bluetooth speaker Connect via Bluetooth or use TF card/AUX for playback. Adjust volume and navigate tracks quickly without a separate remote. Portable or deskside multimedia setup Ideal for attaching to a desk speaker or small audio system that supports multiple sources; switch among Bluetooth, TF card, FM, and AUX as needed using the M key. Specifications and compatibility Audio sources: Bluetooth, TF card, FM, AUX Control interface: one knob for volume and playback, lever for power, M key to cycle sources Playback controls: knob turns for volume, knob clicks for track navigation Power: lever clockwise to turn on, counterclockwise to turn off Notes All features are described as provided: volume control via knob, track navigation via knob clicks, power via lever, and source switching via M key.