1. Bluetooth 5.0 version provides higher transmission efficiency and a transmission distance of up to 15 meters without obstruction. 2. Equipped with a sizeable heat sink for efficient heat dissipation. 3. Features a potentiometer for volume adjustment and an on/off switch for easy control, suitable for DIY speaker projects. If using a metal enclosure, ensure the Bluetooth antenna is properly extended. 4. Utilizes a copper DC connector designed to handle high current with minimal heat generation. 5. Incorporates 4x 470uF green gold capacitors to ensure stable power storage and continuous, reliable power supply, supporting high-quality audio performance. 6. Includes a DC power input with cable that is compatible with the product’s power interface, allowing connection even without a dedicated DC adapter or battery. Adapter Supply Voltage: 5–24V (compatible with 9V, 12V, 15V, 18V, 24V adapters; higher voltage recommended) Power Output at Different Voltages: - 12V: 8 ohm speaker – 24W + 24W (L+R), 4 ohm speaker – 40W + 40W - 15V: 8 ohm speaker – 32W + 32W, 4 ohm speaker – 60W + 60W - 19V: 8 ohm speaker – 64W + 64W, 4 ohm speaker – 80W + 80W - 24V: 8 ohm speaker – 72W + 72W, 4 ohm speaker – 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 Range: 15 meters (unobstructed) 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 serves as a standby switch. When turned off, the device enters a low-power standby mode. To completely cut off power, disconnect the DC plug, especially during extended non-use. For optimal output power, ensure sufficient audio input and adequate power supply voltage and current. Higher supply voltage results in greater output power. Output power varies with speaker impedance. With sufficient voltage and current, higher impedance speakers will produce relatively lower power output. Note: Package includes only the items listed above. Other accessories or products are not included. Color representation may vary slightly due to lighting and monitor settings. Measurement tolerance: ±1–3 cm.