1. Bluetooth version 5.0 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 used in a metal enclosure, ensure the Bluetooth antenna is properly extended. 4. Uses a copper DC connector designed to handle high current with minimal heat generation. 5. Incorporates 4x 470uF capacitors to ensure stable power storage and continuous power supply, supporting high-quality o performance. 6. Includes a DC power input with cable for compatibility with standard power adapters. Can be connected directly even without a dedicated DC adapter or battery. Power Supply Voltage: 5-24V (Compatible with 9V, 12V, 15V, 18V, 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 digital amplifier chip With Filter: Yes Compatible Speakers: 4 ohm to 8 ohm, 50W to 300W 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 + 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: Optimal output power requires sufficient o 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 produce relatively lower output power. Note: The package includes only the items listed. Other accessories or devices shown are not included. Note: Lighting and display settings may cause slight variations in the color of the product as seen on screen. Measurement tolerance: +/- 1-3 cm.