1. Bluetooth version 5.0 provides higher transmission efficiency and longer transmission distance. 2. Large-size heat sink ensures efficient heat dissipation. 3. Potentiometer allows volume adjustment with an on/off switch for easy control, making it ideal for DIY speaker projects. If used in a metal enclosure, the Bluetooth antenna must be extended outside. 4. Copper DC connector is designed to handle high current with minimal heat generation. 5. Equipped with 4x 470uF high-quality capacitors to ensure stable power storage and continuous power supply, supporting high-quality audio performance. 6. DC power input with cable ensures compatibility with the products power interface. Easy to connect even without a dedicated DC adapter or battery. Power Supply Voltage: 524V (Recommended: 9V, 12V, 15V, 18V, or 24V adapter; higher voltage recommended for better performance) Output Power: - 12V: 8 speaker 24W + 24W (L + R), 4 speaker 40W + 40W - 15V: 8 speaker 32W + 32W, 4 speaker 60W + 60W - 19V: 8 speaker 64W + 64W, 4 speaker 80W + 80W - 24V: 8 speaker 72W + 72W, 4 speaker 100W + 100W Product Name: HIFI Bluetooth Digital Power Amplifier Board with Filter Model: 1002L Chip Solution: Standard digital amplifier chip With Filter: Yes Compatible Speakers: 50W300W, 48 Channels: Stereo (Left and Right) Bluetooth Version: 5.0 Bluetooth Range: Up to 15 meters (unobstructed) Protection Features: Overheating protection, short circuit protection Color: Black Material: Metal + PCB Package Contents: 1 x Bluetooth 5.0 Digital Amplifier Board 1 x Screwdriver 1 x Power Cord Note: The power switch on the board is a standby switch. When turned off, the unit remains in low-power standby mode. To completely disconnect power, unplug the DC power source. Tip: Optimal output power requires sufficient input signal and adequate power supply voltage/current. Higher supply voltage results in higher output power. Output power varies with speaker impedance. With sufficient voltage and current, higher impedance speakers will produce relatively lower power output. Please consider this when selecting speakers. Package includes only the items listed above. Other accessories not included. Note: Lighting and display settings may cause slight color differences between the image and the actual item. Measurement error allowed within +/- 13 cm.