LeaningTech Digital Stereo Audio Component Receiver (FM002 DSP&PLL Module) DSP & PLL Digital Stereo FM Radio Receiver Module 87-108MHz with Serial Control Adopt the advanced technology of DSP and FM modulation PLL to make sound more realistic, more stable performance LCD display more intuitive and accurate, with very low power consumption and minimal noise interference 30 range digital volume adjustment, can be easily operated with keystrokes. Automatic memory data before the power failure,Automatically switched speaker and reciver output