2.1 Channel Bluetooth Power Amplifier Board with 50W + 50W + 100W outputs and a mode switching setup that includes AUX, Bluetooth and USB. This board is designed to fit into existing audio systems and expand their capabilities with easy input switching. Key benefits Flexible 2.1 channel power: two 50W channels plus a 100W output to support varied speaker configurations. Simple mode switching: switch between AUX, Bluetooth and USB with a dedicated button for quick, handson control. Broad compatibility: easily connects to standard AUX devices, Bluetooth sources, and USB playback for a versatile home or office setup. audio path: USB input playback with a filtered output to deliver HiFi, fidelity and definition sound quality. Convenient control at the source: AUX input includes a track wheel button to switch modes and songs, enabling ondevice navigation without a separate remote. Important attributes Function: 2.1 channel amplification with three input options (AUX, Bluetooth, USB) and buttonbased mode switching. Compatibility: compatible with standard AUX devices and USB playback; supports common Bluetooth streaming. Performance: USB playback with filtered output aimed at delivering clear, definition sound quality. Operation: simple button switching for mode changes and an AUX track wheel for indevice control. 23 use scenarios Home stereo upgrade: or augment an existing amplifier with this board to add Bluetooth streaming, USB playback from a memory device, and wired AUX input for legacy players, all from a single compact unit. Desktop multimedia setup: connect a computer or media player via USB for direct playback, stream music from a phone via Bluetooth, or use AUX for a wired connection, with quick mode switching to match activity. Small events or classrooms: run a lightweight amplification solution that accepts Bluetooth from mobile devices for music or presentations, USB for preloaded audio, and AUX for wired devices, with easy ondevice control for instructors or presenters. This description preserves the original product's brand intent, specifications, models and functions while presenting a clear, concise, and conversionfocused overview.