5.0 Bluetooth version, transmission efficiency is higher, transmission distance is up to 15 meters without occlusion. Large size heat sink ensures efficient heat dissipation. Potentiometer to adjust the volume, with a switch for easy control, suitable for DIY speakers. If used in a metal enclosure, the Bluetooth antenna must be extended outside. Copper DC connector is adopted to withstand high current and prevent overheating. 4x470uF green gold capacitor ensures sufficient power storage capacity and provides continuous, stable power supply for improved sound quality. DC power input with cable is compatible with the product's power interface. Even without a DC adapter or battery, it can be connected via appropriate power source. Adaptation Supply Voltage: 5-24V (compatible with 9V/12V/15V/18V/24V adapters, high 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: Domestic With Filter: Yes Compatible Speaker Power: 50W-300W, Impedance: 4 ohm - 8 ohm Number of Channels: Stereo (Left and Right) Bluetooth Version: 5.0 Bluetooth Transmission Distance: 15 meters (no 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 cut off power, disconnect the DC plug. For long-term storage, remove the power source. Tip: Adequate o input and sufficient power supply voltage/current are required for optimal output power. Higher supply voltage results in higher output power. Output power varies with speaker impedance. With sufficient voltage and current, higher impedance speakers will have relatively lower output power. Please take note. Package includes only the items listed. Other accessories or products are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error allowed is +/- 1-3 cm.