Bluetooth 5.0 version provides higher transmission efficiency and longer transmission distance. Large-size heat sink ensures efficient heat dissipation. Potentiometer allows volume adjustment with an on/off switch for easy control, ideal for DIY speaker projects. If using a metal enclosure, ensure the Bluetooth antenna is extended outside. Copper DC connector supports high current with minimal heat generation. Equipped with 4 x 470uF capacitors to ensure stable power storage and continuous power supply for improved performance. DC power input with cable allows compatibility with various power sources. Easy connection even without a dedicated DC adapter or battery. Adaptation Supply Voltage: 5–24V (compatible with 9V, 12V, 15V, 18V, 24V adapters; higher voltage recommended for optimal performance) Power Output: - 12V: 24W + 24W (8 ohm), 40W + 40W (4 ohm) - 15V: 32W + 32W (8 ohm), 60W + 60W (4 ohm) - 19V: 64W + 64W (8 ohm), 80W + 80W (4 ohm) - 24V: 72W + 72W (8 ohm), 100W + 100W (4 ohm) Product Name: HIFI Bluetooth Digital Power Amplifier Board with Filter Model: 1002L Chip Solution: Domestic With Filter: Yes Compatible Speaker Power: 50W–300W Impedance: 4–8 ohm Channels: Stereo (Left and Right) Bluetooth Version: 5.0 Bluetooth Range: Up to 15 meters (line of sight) Protection Features: Overheating protection, Short circuit protection Color: Black Material: Metal + PCB Package Contents: 1 x Bluetooth 5.0 Digital Amplifier Board 1 x Shell 1 x Screwdriver 1 x Power Cord Usage Notes: The power switch on the board is a standby switch. When turned off, the device enters low-power standby mode. To completely disconnect power, unplug the DC connector. For optimal output power, ensure sufficient input and adequate power supply voltage and current. Higher supply voltage results in higher output power. Output power varies with speaker impedance. With sufficient power supply, higher impedance speakers will produce relatively lower power output. Note: Package includes only the items listed. Other accessories or devices shown are not included. Note: Slight color differences may occur due to lighting and monitor settings. Measurement tolerance: ±1–3 cm.