Efficient, source flexible playback control for USB, TF, Bluetooth and Radio devices. This compact control unit lets you manage volume and playback with three buttons. Prev/VOL-: - Long press to decrease volume - Short press in USB/TF/Bluetooth/Radio mode goes to the previous track or previous station Play/Pau: - In USB/TF/Bluetooth mode, short press toggles play/pause - Long press switches mode Next/VOL+: - Long press to increase volume - Short press in USB/TF/Bluetooth/Radio mode goes to the next track or next station Key benefits: - Simple, consistent controls across multiple sources, reducing distraction - Quick access to volume and playback without touching your host device - Easy mode switching without navigating menus Compatibility: - USB flash drives, TF microSD cards, Bluetooth audio devices, and FM Radio modes Use scenarios: - In-car playback: control music or radio without taking eyes off the road - Home listening: pair with a Bluetooth speaker and manage playback from the unit - Outdoor use: connect to a portable Bluetooth speaker for convenient audio control on the go