Feature: 1. Stereo Dual Channel: The power amplifier board module is stereo dual channel output to ensure continuous serial high power operation. 2. Knob Control: The board is equipped with treble and bass control, which can be adjusted through the knob, convenient and quick. 3. Good Transmission: Bluetooth version 5.0, the transmission distance can reach 10 meters in an open environment, can also use a 3.5mm headphone plug. 4. Circuit Protection: With overheating protection, circuit protection, overvoltage and undervoltage protection, safe and durable. 5. Use Excellent Chip: Using TPA3116D2 chip, with AM interference suppression, has low interference and good transmission effect. Specification: Item Type: Power Amplifier Board Module Material: PCB Model: ZK-502T Chip: TPA3116D2 (with AM interference suppression) Bluetooth Version: 5.0 (unobstructed, approx. 10 meters / 32.8ft) Signal to Noise Ratio: >90 dB Input Method: AUX + Bluetooth Number of Channels: Left and right dual channels (stereo) Adapter Power Supply: DC 9-24V, 3A or above (24V battery set is not allowed) Adaptation Speaker: 15-100W, 4-8Ω Power Supply Voltage: 12V, 8Ω 15W+15W, 4Ω 30W+30W 19V, 8Ω 20W+20W, 4Ω 40W+40W 24V, 8Ω 30W+30W, 4Ω 50W+50W Protection Mechanism: Overheating, overcurrent, short circuit protection. Package List: 1 x Power Amplifier Board Module(Finished Product)1 x Heat Sink Block1 x Cable1 x Screw1 x Screwdriver Note: Do not use it outside the voltage and current range.