1. Bluetooth 5.0 version for improved transmission efficiency and extended range. 2. Large heat sink ensures efficient thermal dissipation. 3. Volume control potentiometer with on/off switch for easy operation. Suitable for DIY speaker projects. If using a metal enclosure, ensure proper Bluetooth antenna placement. 4. Copper DC power connector designed for high-current applications with minimal heat generation. 5. Four 470µF capacitors provide stable power storage and consistent power delivery, supporting high-fidelity audio performance. 6. DC power input with cable allows flexible connection to compatible power sources. Input Voltage Range: 5–24V (compatible with 9V, 12V, 15V, 18V, and 24V adapters; higher voltage recommended for increased output power). Power Output Specifications: - At 12V: 24W + 24W into 8Ω; 40W + 40W into 4Ω - At 15V: 32W + 32W into 8Ω; >60W + >60W into 4Ω - At 19V: 64W + 64W into 8Ω; >80W + >80W into 4Ω - At 24V: 72W + 72W into 8Ω; >100W + >100W into 4Ω Product Name: HIFI Bluetooth Digital Power Amplifier Board with Filter Model: ZK-1002L Chip Solution: Domestic IC Filter Included: Yes Compatible Speaker Impedance: 4Ω–8Ω Speaker Power Range: 50W–300W per channel Channels: Stereo (Left/Right) Bluetooth Version: 5.0 Bluetooth Range: Up to 15 meters (line-of-sight) Protection Features: Overheating protection, short-circuit protection Color: Black Material: Metal + PC Package Contents: - 1 × Bluetooth 5.0 Digital Amplifier Board - 1 × Enclosure - 1 × Screwdriver - 1 × Power Cord Usage Notes: - The board’s power switch functions as a standby switch. When off, the unit enters low-power standby mode. - To fully disconnect power, unplug the DC power supply. - Maximum output power depends on sufficient audio input signal, adequate supply voltage, and current capacity. - Higher supply voltage increases available output power. - Output power varies with speaker impedance: for a given voltage and current, higher impedance results in lower output power. Note: Color representation may vary slightly due to lighting conditions and screen settings. Dimensions are subject to a tolerance of ±1–3 cm.