1. Bluetooth version 5.0 provides higher transmission efficiency and longer transmission distance. 2. 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 capacitors to ensure stable power storage and continuous power supply, supporting high-quality audio performance. 6. DC power input with cable allows compatibility with standard power adapters. Even without a dedicated DC adapter or battery, connection is possible. Adaptation Supply Voltage: 5-24V (compatible with 9V, 12V, 15V, 18V, or 24V power 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: Standard digital amplifier chip With Filter: Yes Compatible Speakers: 50W-300W, 4 ohm to 8 ohm Channels: Stereo (Left and Right) Bluetooth Version: 5.0 Bluetooth Transmission Distance: Up to 15 meters (in open space, unobstructed) 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 Note: The power switch on the board is a standby switch. When turned off, the unit enters low-power standby mode. To completely disconnect power, unplug the DC power connector. Tip: Maximum output power depends on sufficient input signal 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 output power. Please consider this when selecting components. Note: Only the items listed are included. Other accessories or devices shown are not part of the package. Note: Lighting and display settings may cause slight variations in the color of the product as seen on screen compared to the actual item. Measurement tolerance: +/- 1-3 cm.