This board uses the high-performance TDA8932 digital power amplifier chip, which has small size, high efficiency, high power, good sound quality, and does not need to install additional radiators. It is very suitable for the application of active speaker reconstruction, electro-acoustic engineering implementation, and sound product development. Working voltage: single DC10 - 30V, 24V voltage is recommended, switching power supply with current above 2A Output power: 35w x 1 Speaker impedance: 4-8 ohms, best 8 ohms Circuit structure: mono BTL output colour:blue Material:ABS size:Single about: 45 x 31 x 10mm Package Contents: 2 x Amplifier Board Module Only the above package content, other products are not included. Note: Light 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.