1、High power makes the low stress more vivid, without loss of high‑definition sound quality. 2、Have large heat dissipation area, have a long service time, can be used for a long time. 3、Made of high‑quality material PCB, 1.6mm thick double‑sided sheet, sturdy and durable. 4、The whole process of spraying tin ensures good passing performance of large and small currents. 5、Small in size and light in weight, convenient to carry and use at any time, very convenient and practical. Item Type: Power Amplifier Board Module Material: PCB Amplifier Output Power: Typical 20W (maximum 30W) Speaker Impedance: 4Ω-8Ω Total Harmonic Distortion: <0.04% Signal to Noise Ratio: 105dB Frequency Response: 14Hz-100kHz (the maximum range calculated by the RC high-low-pass circuit is 3.29Hz-482.29kHz) 1 x Power Amplifier Board Module 2 x Radio Tube