Power Supply Selection: The power supply of the module is very important. The power supply requires small output ripple and low internal resistance. The higher the voltage, the higher the current, and the more power is sufficient. Speaker selection: Commonly used speakers are usually 4 ohm or 8 ohm. If your speaker has low power, it may be between 10W and 30W. The power supply voltage is lower to prevent the speaker from burning out after amplified sound. HIFI Stereo: Card 100W dual channel power amplifier for HIFI music. With AUX, Bluetooth, USB dongle, USB sound card multiple audio input methods. The sound quality is wonderful, so you can hear music on the move better. Compatibility: Bluetooth version 5.0 has a wireless range of up to 15m (49ft) in open space. The transmission efficiency is higher, more stable, and the transmission distance is longer. It can be widely used in various devices such as tablet computers, TVs, smart phones and laptops. Note: The input power is insufficient and the power supply itself is protected against intermittent power failures. Please replace it with a more powerful power supply; or if the power is too large, the power amplifier board generates large heat and thermal protection occurs. Reduce power consumption or improve heat dissipation.