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 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 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. Colour:Black Material:Plastic Size:9.3x9x2.2cm Package Contents: 1 * Bluetooth Power Amplifier board 2 * Acrylic cover 1 set * accessories 1 * Screwdriver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.