and high quality Features: Stereo o with wide frequency response, high efficiency, low distortion, and low noise for excellent sound quality. Designed with a volume potentiometer for easy volume adjustment. Includes protection against power supply reverse connection, short-circuit, and overheating. Supports wide supply voltage and offers two o input modes for improved efficiency. Specification: Material: PCB circuit board Size: Approximately 55 x 38 x 18 cm Color: As shown in picture Quantity: 1 piece Product parameters: Product Model: XY-P40W Supply Voltage: DC 8–24V Bluetooth Version: 5.0 Connection Distance: Up to 15 meters (line of sight) Output Mode: Stereo Output Power: - 20W x 2 @ 12V, 4Ω - 30W x 2 @ 16V, 4Ω - 30W x 2 @ 21V, 8Ω - 40W x 2 @ 24V, 8Ω Recommended Speaker Power (40W–200W): - 4Ω (for 5–16V supply) - 8Ω (for 5–24V supply) Operating Instructions: 1. After connecting the power supply, the blue LED turns on and the device enters Bluetooth pairing mode, emitting a beep to indicate readiness. 2. Enable Bluetooth on your phone and search for "XY-P40W". Select the device to connect. A beep confirms successful connection. 3. Begin playing music. The amplifier board will emit a beep and be ready for the next pairing when available. Caution: 1. Keep a safe distance from routers to avoid Wi-Fi interference. 2. Use 5–24V DC power supply; voltages above 26V may cause damage. 3. When driving a 4Ω load, power supply must not exceed 16V; for an 8Ω load, power supply must not exceed 24V. 4. Power supply must provide at least 2A current. 5. Speaker wires should not exceed one meter in length. 6. For ESD protection, discharge static electricity from your body before handling the module. 7. Speakers with 40W or higher power rating are recommended. Note: No retail packaging included. Slight variations of up to 1 cm may occur due to manual measurement. Images may not reflect the actual color due to differences in monitor displays. Package Includes: 1 x Bluetooth Amplifier Board 1 x User Manual