HER503 is a micro-power FM/AM radio module developed by Yangjie Electronics Co., Ltd. It integrates a complete FM/AM receiver system and includes a low voltage radio frequency single chip (RF1S4164AS). This module can receive frequency band from 87.5M-108M and 520K-1710K, and has a maximum power consumption of only 30mW. In addition, it supports user-defined frequency reception, providing a two-channel input interface, with the highest sensitivity up to 1.6uV. In terms of video format, it can receive NFM, WFM, WWBB, and is also compatible with DAB, DAB+, and DMB radio sources. In addition, the module can support Ethernet interface communication, providing a wide range of functions such as remote control, sound source selection, and server data reading.