The features are as follows: 1. Using high-speed placement machine to mount, high temperature reflow soldering, the performance is very stable, and the non-manual soldering process can be compared. 2. Equipped with 4 sets of gain adjustments (note that technical support can be provided for batch orders, if it is a single chip, 't ask how to change it, the gain of this board is adjusted to the maximum by default). 3. The ultra-small 70X57MM can be used for repairing, polishing active speakers, improving sound quality, or using multi-block multi-channel power amplifiers or 2.1 power amplifiers, which has many uses. 4. It has built-in output short-circuit and over-temperature and overload protection, and prevents the shock of switching , which is rare in other 50W power amplifier boards. 5. Precautions for use: When the speaker impedance is 4 ohms, the working voltage must be less than 18V; when the speaker impedance is 6 ohms, the working voltage cannot 24V; when the speaker impedance is 8 ohms, the working voltage cannot 26V, and the polarity of the power supply should not Reverse. Specification: Product Name: Digital Power Amplifier Board Chip: TDA7492 DC single voltage: 10-26V Power: 50W*2/8 Mono power: 100W/4 Size: 70 x 57mm, height 21mm (including heat sink) Material: PCB+metal colour: blue Package Contents: 1 x TDA7492 power amplifier board 1 x connector cable 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.