1、PCB adopts 6mm thick double‑sided board, and the whole process of spraying tin to ensure good passing performance of large and small currents 2、The product is light in weight and can be operated with one hand to reduce operator fatigue 3、Large‑area heat dissipation can ensure that the product can run for a longer time, with good stability and long service life 4、Contains DSP digital signal processor, which processes the audio signal, realizes digital noise reduction and digital filtering 5、The DSP digital signal processor is suitable for radio receiver use and machine input audio signal, etc. 1 x DSP Digital Signal Processor Item Type: DSP Digital Signal ProcessorMaterial: PCB 1. 3.5mm audio interface input with audio frequency spectrum display 2. DNR is the noise reduction level, a total of 10 levels 3. FLT is a digital filter with 10 levels, including 200hz low pass, 500hz low pass, 700hz low pass, 1khz low pass, 1.8khz low pass, 2khz low pass, 2.4khz low pass, 3.5khz low pass, 6khz low pass, through 4. The filter and noise reducer can be used together freely, and the button setting is simple and clearPower supply is microUSB input, built-in speaker, or external speaker or power amplifier, the effect is better 5. Very suitable for old radio stations without noise reduction function, just output the radio audio to this machine.