5.0 Bluetooth version provides higher transmission efficiency and longer transmission distance. Size-appropriate heat sink ensures efficient heat dissipation. Equipped with a potentiometer to adjust volume and an on/off switch for easy control, ideal for DIY speaker projects. If using a metal enclosure, the Bluetooth antenna must be extended externally. Copper DC connector is used to handle high current with minimal heat generation. Features 4x470uF capacitors to ensure stable power storage and continuous power supply, supporting high-quality audio performance. 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, 4 ohm speaker / 40W + 40W - 15V: 8 ohm / 32W + 32W, 4 ohm / 60W + 60W - 19V: 8 ohm / 64W + 64W, 4 ohm / 80W + 80W - 24V: 8 ohm / 72W + 72W, 4 ohm / 100W + 100W 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, no obstruction) Protection Features: Overheating protection, short circuit protection Color: Black Material: Metal and PC 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 unit enters low-power standby mode. To completely disconnect power, unplug the DC power source. Tip: Optimal output power requires sufficient input voltage and current. Higher supply voltage results in increased output power. Output varies depending on speaker impedance. With adequate power supply, higher impedance speakers will produce relatively lower output power. Please take note. Contents include only the items listed above; other accessories 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.