Versatile Connectivity: This amplifier board supports two audio input methods: Bluetooth 5.0 for efficient, long-range wireless connectivity up to 49 feet, and a 3.5mm AUX input for traditional wired audio sources. Seamlessly switch between inputs to suit your audio needs. Enhanced Sound Control: Experience superior sound customization with the treble and bass adjustment knobs on this 2.1 channel amplifier. Delivering a maximum output of 2X50W+100W, it allows you to fine-tune audio frequencies to achieve high-quality, layered sound and impactful bass. Advanced Protection Features: Equipped with multiple features, this amplifier board includes short circuit, overcurrent, overheating, and anti-reverse connection protection. These safeguards help prevent damage and ensure reliable performance under various conditions. Construction: Constructed with high-quality copper DC connectors and barrier style terminals, this amplifier board is designed to handle large currents efficiently without overheating or wire damage. It includes a compatible DC lead for connection, even without a standard adapter. Model: MT21 Channel: 2.1 Stereo Adaption Supply Voltage: 12-24V / 5A above (Do not connect to 24V battery pack) Output Power: max 50W per channel; max 100W subwoofer NOTE: Please note that this product does not include a power supply; you need to equip it with a DC power supply. Color: Black Material: Plastic Size: 9.3 x 9 x 2.2 cm Package Contents: 1 x Bluetooth Power Amplifier Board 2 x Acrylic Cover 1 set x Accessories 1 x Screwdriver Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.