Robust electrical connection Copper DC connector and fencetype terminals provide strong current handling, reducing heat generation and preventing wire damage. Powerful 2.1 channel amplifier Bluetooth audio amplifier module with 2.1 channels and a maximum output power of 2 x 50 W plus 100 W for the sub channel. Includes antenna and antenna base for improved signal quality, higher efficiency, and strong antiinterference performance. Flexible input options Two input methods: AUX and Bluetooth, 2in1 configuration. Bluetooth version 5.0 delivers higher transmission efficiency and longer range. Safety and protection Builtin protection for short circuits, overcurrent, overheating, and reverse connection to prevent total failure. On overload, the device reports the fault condition to its processor to protect itself from damage. Key attributes Function: Bluetooth audio amplifier module, 2.1 channel, with independent subwoofer support. Compatibility: Supports AUX and Bluetooth inputs; Bluetooth 5.0 for enhanced range and reliability. Material and construction: Copper DC connector and fencetype terminals for durable connectivity. Performance: current capability with efficient signal transmission, strong antiinterference characteristics. 23 practical use scenarios Home stereo upgrade: Use the AUX input for wired sources and pair Bluetooth devices for wireless playback. Connect the speaker outputs through the fencetype terminals to your loudspeakers, and enjoy enhanced power delivery with reduced wiring heat. DIY 2.1 speaker project: Integrate this module into a custom 2.1 speaker system with a dedicated sub, using the sub channel for low end and the two 50 W channels for stereo highs and mids. The external antenna helps maintain stable wireless streaming from phones or processors. Small outdoor or indoor event setup: Create a compact, reliable audio system by wiring the main speakers to the 2 x 50 W channels and the sub to the 100 W channel, while using Bluetooth 5.0 for easy source switching and AUX for wired devices. The builtin protections help prevent damage in variable installation environments.