This stereo amplifier uses the original TPA3116D2 amplifier chip for better matching, less interference and less heat. Original prefabricated chips, high quality SMD components, stable performance. Increase the heat sink to meet the high voltage power supply. All parts used are genuine and have long-term stability. Features: 1. Support for low-impedance speakers: Suitable for high power voltages of 24V, supports 3.5-8 ohm speakers, and has a wide range of applications. 2. Power input connector: with junction box. 3. Power shock protection design, POP switch without sound explosion. 4. Audio input connector: Standard 3.5MM audio cable input jack, or audio input for 3P jack. 5. With LED power display, easier to use. Specification: Materia: PCB Color: blue Operating voltage range: DC 9-25V Maximum output power: 50W (left channel) + 50W (right channel) two channels Dual output power: 12V / 10 + 10W (8 ohms) / 15 + 15W (4 ohms) 15V / 13 + 13W (8 ohms) / 25 + 25W (4 ohms) 19V / 22 + 22W (8 euros) 39 + 39W (4 ohms) 22-24V /> 32 + 32W (8 Euro) /> 50 + 50W (4 ohms) Size: approx. 9.5 * 5 * 2 cm / 3.7 * 2.0 * 0.8in Weight: approx. 56g Package List: 1 * Stereo Amplifier Note: Generally, the higher the supply voltage, the greater the output power that can be supported. Different impedance speakers can support different output powers, and usually smaller speakers in Europe are also easier to make. About Audio Input Terminal: Please try to use a shielded type of cable to reduce noise and current sound input connector incurred. The connecting cable is available between the lines open or shorted, will lead to noise or current sound, no sound track, etc. 1、Support for low-impedance speakers: Suitable for high power voltages of 24V, supports 3.5-8 ohm speakers, and has a wide range of applications 2、Power input connector: with junction box 3、Power shock protection design, POP switch without sound explosion 4、Audio input connector: Standard 3.5MM audio cable input jack, or audio input for 3P jack 5、With LED power display, easier to use