Description: Power supply: DC5-24V/10A or above Bluetooth version 5.0. Audio input: Bluetooth+AUX+U disk+USB sound card. Audio output: passive speaker + 3.5mm interface stereo output. Volume adjustment: high-end encoder knob adjustment, smooth hand feel. Frequency range: 20Hz-30KHz. SNR: 92dB. Adapter speaker: 20W-200W/492-89. Output power: 100W x 2. Protection mechanism: electrostatic protection, overheat protection, overcurrent protection, short circuit protection. Special function: support Sinilink-APP control. Product size: 93 x 65 x 25 mm. Note: 1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 2. Please allow slight dimension difference due to different manual measurement. Thank you for your understanding. 1. Heat sink installation: When assembling, we must pay attention to the installation of the heat sink. After sticking the heat dissipation silicone on the heat sink, we will stick the side of the heat sink with the silicone on the power amplifier chip; pay attention to the metal shell of the heat sink must not be in contact with the surrounding components to avoid short circuit; finally, the roof board is pressed against the heat sink, and the heat dissipation through the roof board to achieve better heat dissipation effect. 2. Audio input mode switch: When this product is not mounted on any external audio device, the default power is Bluetooth mode; if you mount an external playback device such as an AUX or USB disk, the default mode is AUX or J disk playback mode; In the process of playback, the principle of backplug device priority should be followed. For example, if an AUX is inserted during Bluetooth playback, it will be switched to AUX playback immediately. If inserted U disk, switch to U disk to play immediately; switching audio mode can also be selected by APP, which is very convenient. 1) When AUX is playing, try to choose AUX line with shielding layer to reduce noise. 2) Try to use MP3 format for U disk playback. The sampling rate of WAV format must be less than 44100Hz. If the sampling rate is too high, it may not be able to play. 3) When using the function of USB sound card, you can connect the computer with USB data cable without installing any driver. Most computer systems will switch USB sound card by default. If you can't switch it automatically, you can manually select the switch. 3.The power selection: The power supply range of this product is 5-24VDC, compatible with the standard 5.5-2.1/2.5 power adapter plug, it is recommended to use the standard 12V/24V power adapter, the current output is more than 10A. 1) Select the power size and the use of the horn power related, such as the use of 8 ohm 100W horn, the use of 24V power supply, current at least 6A above; the current is too small, which may appear sound stagnation phenomenon, reduce the volume and the output power can solve this problem. 2) Power supply voltage can not be higher than 26V; higher than 26V, the circuit board will be burned. 3) If the amplifier board is restarted after the volume is turned up during the playback, it is caused by insufficient power supply, and the power supply with greater output current can be replaced. 4.