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 using a metal enclosure, ensure the Bluetooth antenna is properly extended. 4. Utilizes a copper DC connector designed to handle high current with minimal heat generation. 5. Incorporates 4x 470uF green gold capacitors to ensure stable power storage and continuous power supply, supporting high-quality o performance. 6. The DC power input with cable is compatible with the product’s power interface, allowing connection even if a DC adapter or battery is not immediately available. Adaptation Supply Voltage: 5–24V (compatible with 9V, 12V, 15V, 18V, 24V adapters; higher voltage recommended) Rated Power Supply Voltage: 12V Output Power: - 8 ohm speaker: 24W + 24W (L+R) - 4 ohm speaker: 40W + 40W (L+R) At 15V: - 8 ohm: 32W + 32W - 4 ohm: 60W + 60W At 19V: - 8 ohm: 64W + 64W - 4 ohm: 80W + 80W At 24V: - 8 ohm: 72W + 72W - 4 ohm: 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 Range: 15 meters (unobstructed) Protection Features: Overheating protection, short circuit protection Color: Black Material: Metal + PC 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 is a standby switch. When turned off, the unit enters a low-power standby mode. To completely disconnect power, especially for long-term storage, remove the DC plug. For optimal output power, ensure sufficient o 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. 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 product. Measurement tolerance: +/- 1–3 cm.