Product Name: Bluetooth Amplifier Board with Subwoofer Extension Model: -SUB600 Power Supply: Operating voltage range: 18-50VDC, maximum: 53V. Recommended voltage: 36-48V, 10A or higher. Maximum Power: Single-channel 300W @ 50V, 4; 160W @ 50V, 8. The higher the voltage and the lower the resistance, the greater the output power. Bluetooth Chipset: 5.3, transmission distance: 10 meters Input Method: Bluetooth + AUX + USB flash drive/sound card Number of Channels: 2.0+ Amplifier Chipset: TPA3255 Protection: Input undervoltage, overheating, overcurrent, and short-circuit protection. No reverse polarity protection; do not connect the positive and negative poles. Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Specification:SUB600 lead type Color: As Shown Material: PCB Package Contents: 1 * Digital Amplifier Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.