5.0 Bluetooth version, transmission efficiency is higher, transmission distance is up to 15m 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, providing continuous and stable power supply for improved sound quality. DC power jack with cable allows compatibility with the input power interface of this product; can be connected 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). Power Output: - 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 2X100W 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: 15m (without obstruction) 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 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, especially during long-term non-use. Tip: For optimal output power, ensure sufficient o 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 will produce relatively lower output power. 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 item. Measurement error allowed is +/- 1-3cm.