Description: Resistors use precision patches to ensure a good signal-to-noise ratio. Built-in TPA3255 Class D Bluetooth chip and Bluetooth 5.0 input function. PCB uses 1.6mm thick double-sided sheet, 2.0 oz copper thickness, spray tin full process, to ensure good passing performance of large and small current. First-class PCB quality. Use high-current inductors for red and gray audio to ensure the sound is crisp and powerful. This machine adopts all-aluminum chassis, the surface of the chassis is all processed by brushed oxidation coloring process, all aluminum knobs, feel very good. The main filter electrolytic capacitor is 1000UF/50V, which guarantees a strong and continuous power support. Input method: analog and Bluetooth two way input. When the two modes are input at the same time, the Bluetooth input is prioritized, when the Bluetooth is connected, the RCA input is automatically disconnected. Please turn off the Bluetooth function of the mobile phone when you need analog input. Specification: Size: 185x104x40mm Input Voltage: 30V-48V Working Method: Class D Total output power at 1% total harmonic distortion + noise (THD+N) 240W/4ohm, 240W*2 output Total output power at 10% total harmonic distortion + noise (THD+N) 325W/4ohm, 325W*2 output Package Includes: 1 Piece Audio Amplifier Decoder Note: Power Supply is Not Included, you may need to prepare one by yourself, thank you for your understanding.