With the portable Li-Ion battery powered Stereo FM Transmitter you can transmit audio of any kind. Simply plug your audio source into the 3.5mm audio jack, set the desired frequency, and then tune any standard FM radio receiver to receive the signal. This device is equipped with cost-effective components, including a CH32V003J4M6 32-bit RISC-V microcontroller, a KT0803K/L transmitter IC, a 128x32 pixel OLED display (SSD1306), and a Li-Ion battery charger (TP4054).
I need modem, send digital data and receive it and convert.
Simple walkie talkie plug to computer, or to phone, or nothin. Simple type and send and receive