Bluetooth version 5.0 with unobstructed range up to 15 meters for reliable wireless audio Input methods AUX Bluetooth USB for flexible source options Product name 2.1 channel Bluetooth audio amplifier module Product model HT21 3G Key benefits Easy integration: add wireless Bluetooth input to existing speakers or audio systems without replacing your setup Flexible sources: switch between AUX, Bluetooth, and USB to suit different devices and listening needs Simple control: wheel button enables quick mode switching and track selection for convenient operation 2.1 channel performance: designed to drive a compact speaker system with clear stereo sound and enhanced audio output Specifications and attributes Function: 2.1 channel Bluetooth audio amplifier module for DIY and upgrade projects Compatibility: supports AUX, Bluetooth, and USB inputs for broad device compatibility Performance: Bluetooth 5.0 delivers wireless streaming with up to 15 meters unobstructed range Model: HT21 3G Use scenarios Home stereo upgrade: connect existing bookshelf or desktop speakers via AUX or USB, and stream music wirelessly from a phone or tablet using Bluetooth Dorm or small room multimedia setup: use Bluetooth or USB input to play audio from a computer, laptop, or USB source with enhanced amplification DIY audio projects: incorporate into a compact 2.1 channel speaker build to achieve wired and wireless connectivity with easy source switching Note: This description preserves the original product branding, specifications, model, and functional details without adding or omitting information.