1. Bluetooth version 5.0 provides higher transmission efficiency and longer transmission distance. 2. Large-size heat sink ensures efficient heat dissipation. 3. Equipped with a potentiometer to adjust volume and 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 externally. 4. Features a copper DC connector designed to handle high current with minimal heat generation. 5. Incorporates 4 x 470uF high-quality capacitors to ensure stable power storage and continuous power supply, supporting consistent audio performance. 6. The DC power connector with cable allows compatibility with the products input power interface, enabling easy connection even without a dedicated DC adapter or battery. Power Supply Voltage: 524V (compatible with 9V, 12V, 15V, 18V, or 24V adapters; higher voltage recommended for optimal performance) Output Power: - 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: Standard Filter: Included Compatible Speakers: 50W300W, 4 ohm8 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 Screwdriver 1 x Power Cord Note: The power switch on the board is a standby switch. When turned off, the unit enters a low-power standby mode. To completely disconnect power, unplug the DC power connector. Tip: Optimal output power requires sufficient audio input and adequate power supply voltage and current. Higher supply voltage results in increased output power. Output power varies with speaker impedance. With sufficient voltage and current, higher impedance speakers will produce relatively lower power output. Please take note. Package includes only the items listed above. Other accessories or products are not included. Note: Lighting and display settings may cause slight variations in the color of the item as shown in images compared to the actual product. Measurement tolerance: 13 cm.