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 used in a metal enclosure, the Bluetooth antenna must be extended externally. 4. Copper DC connector is designed 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 o 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: - 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 (in open space, without obstruction) 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 serves as 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 o input and adequate power supply voltage and current. Higher supply voltage results in greater output power. Output power varies depending on speaker impedance. With sufficient voltage and current, higher impedance speakers produce relatively lower power output. Note: Package includes only the items listed. Other accessories or products are not included. Note: Lighting and display settings may cause slight variations in the color of the item as shown. Measurement error allowed within +/- 1–3 cm.