1. Bluetooth 5.0 version provides higher transmission efficiency and longer transmission distance. 2. Size heat sink ensures efficient heat dissipation. 3. Potentiometer allows volume adjustment with an on/off switch for easy control, ideal for DIY speaker projects. If used in a metal enclosure, ensure the Bluetooth antenna is extended externally. 4. Copper DC connector designed to handle high current with minimal heat generation. 5. Equipped with 4x 470uF capacitors to ensure stable power storage and continuous power supply, supporting high-quality audio performance. 6. DC power input with cable allows compatibility with this product’s power interface. Can be connected even without a dedicated DC adapter or battery. Power Supply Voltage: 5-24V (Recommended: 9V, 12V, 15V, 18V, or 24V adapter; higher voltage recommended for maximum output) Output Power: - 12V: 24W + 24W @ 8Ω, 40W + 40W @ 4Ω - 15V: 32W + 32W @ 8Ω, 60W + 60W @ 4Ω - 19V: 64W + 64W @ 8Ω, 80W + 80W @ 4Ω - 24V: 72W + 72W @ 8Ω, 100W + 100W @ 4Ω Product Name: HIFI Digital Power Amplifier Board with Filter, 2X100W, Bluetooth Model: -1002L Chip Solution: Standard digital amplifier chip With Filter: Yes Compatible Speakers: 50W–300W, 4Ω–8Ω Channels: Stereo (Left and Right) Bluetooth Version: 5.0 Bluetooth Range: Up to 15 meters (unobstructed) 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 unit enters low-power standby mode. To completely disconnect power, unplug the DC power source. Tip: Optimal output power requires sufficient input signal and adequate power supply voltage/current. Higher supply voltage results in increased output power. Output power varies depending on speaker impedance. With sufficient power, lower impedance speakers produce higher output power. Package includes only the items listed above. Other accessories not included. Note: Lighting and display differences may cause slight color variations between the image and actual product. Measurement tolerance: ±1–3 cm.