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, ideal for DIY speaker projects. If using a metal enclosure, ensure the Bluetooth antenna is properly extended. 4. Copper DC connector is used to handle high current with minimal heat generation. 5. Equipped with 4x 470uF green gold 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 product’s power interface. 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 Examples: - 12V: 8 ohm speaker / 24W + 24W (stereo), 4 ohm speaker / 40W + 40W - 15V: 8 ohm speaker / 32W + 32W, 4 ohm speaker / over 60W + 60W - 19V: 8 ohm speaker / 64W + 64W, 4 ohm speaker / over 80W + 80W - 24V: 8 ohm speaker / 72W + 72W, 4 ohm speaker / over 100W + 100W 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 ohm - 8 ohm Channels: Stereo (Left and Right) Bluetooth Version: 5.0 Bluetooth Transmission Distance: Up to 15 meters (line of sight) Protection Features: Overheating protection, Short circuit protection Color: Black Material: Metal + PC 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 power connector. For optimal output power, ensure sufficient audio input and adequate power supply voltage and current. Higher supply voltage results in higher output power. Output power varies with speaker impedance. With sufficient voltage and current, higher impedance speakers will have relatively lower output power. Note: Package includes only the items listed. Other accessories or devices shown are not included. Due to lighting and display differences, the actual product color may vary slightly from the image. Measurement tolerance: +/- 1-3 cm.