Two audio input methods: AUX and Bluetooth enable flexible connection options. Bluetooth version 5.0 provides higher transmission efficiency and longer range. 2in1 design with robust construction: copper DC connector and fencetype terminal to withstand large current, with no heat buildup and no damage to wires. Bluetooth audio amplifier module: 2.1 channel configuration with max output power 2X50W+100W. Includes an antenna and antenna base to improve signal quality, boost efficiency, and enhance antiinterference performance. Comprehensive protection features: shortcircuit protection, overcurrent protection, overheating protection, and antireverse connection protection to prevent total failure. In case of overload, the device reports the fault condition to the processor to safeguard itself. Key benefits and practicality: delivers strong, clear audio with reliable wireless and wired input options, suitable for compact audio systems that require robust electrical protection and current handling. Use scenarios: 1) Incar audio upgrade: stream music via Bluetooth or connect a wired AUX source for versatile playback with stable performance. 2) Home stereo or multimedia setup: pair with Bluetooth devices or use AUX input to enhance a small living room or entertainment space with 2channel and additional 100W capability. 3) DIY speaker projects or small PA systems: leverage the 2.1channel output, integrated antenna, and protective features for a durable, interferenceresistant build. Compatibility and performance notes: supports AUX and Bluetooth inputs, Bluetooth 5.0 for efficient wireless transmission, and a current, heat wire connection via copper DC and fencetype terminals.