5.0 Bluetooth version, higher transmission efficiency, transmission distance up to 15 meters without obstruction. Large-size heat sink ensures efficient heat dissipation. Equipped with a potentiometer to adjust volume and an on/off switch for easy control, suitable for DIY speaker projects. If using a metal enclosure, ensure the Bluetooth antenna is extended externally. Copper DC connector supports high current with minimal heat generation. Features 4 x 470uF high-quality capacitors for stable power storage and continuous power supply, supporting high-quality audio performance. DC power input with cable allows compatibility with the products power interface; can be connected even without a dedicated DC adapter or battery.Adaptation Supply Voltage: 5-24V (compatible with 9V, 12V, 15V, 18V, 24V adapters; higher voltage recommended). 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: Standard digital amplifier chip With Filter: Yes Compatible Speaker Power: 50W-300W, 4 ohm to 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 + PCB Package Includes: 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 cut power, disconnect the DC plug. For optimal performance, ensure sufficient audio input and adequate power supply voltage and current. Higher supply voltage results in higher output power. Output power varies depending on speaker impedance. With sufficient voltage and current, higher impedance speakers produce relatively lower power output. Contents listed above only; other items not included. Note: Lighting and monitor differences may cause slight color variations between the image and actual item. Measurement tolerance: +/- 1-3 cm.