1. Bluetooth 5.0 version 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 using a metal enclosure, ensure the Bluetooth antenna is extended. 4. Copper DC connector is used to handle high current with minimal heat generation. 5. Equipped with 4x 470uF capacitors to ensure stable power storage and continuous power supply, supporting consistent audio performance. 6. DC power input with cable allows compatibility with the product’s power interface. Connection is possible 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 / 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 Speaker 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 Note: 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. Tip: 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 power supply, higher impedance speakers will produce relatively lower output power. Note: Package includes only the items listed. Other accessories or products are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement tolerance: +/- 1-3 cm.