FM Stereo Transmitter Module MP3 Recorder DIY Radio Station Kit -2021.    Feature:  Kit use: private radio, car audio transmitter, cable audio to wireless;  Operating voltage: DC4-6V;  Operating current: 20mA-40mA;  Launch distance: 20-80 meters barrier (affected by production level);  Transmit frequency: 87-108MHz, 14 frequency, through the DIP switch to change the frequency;  Power indication: Yes, less than 4V Auto light off;  Antenna: 300mm soft wire, you can also modify to launch farther distance;  Oscillation mode: PLL phase-locked loop;  Frequency stability: zero drift;  Sound quality: excellent, stereo two-channel transmission, automatic gain control;  Microphone: Yes, PCB onboard;  Microphone distance: 1 meter normal speech;  Microphone and audio input conversion mode: pull out the audio line microphone automatically work;  PCB size: 74mm * 52mm;    Package includes:  1 x DIY FM Stereo Transmitter Module Kit.    Soldered PCB, for reference only