GBJ3504 is an integrated AM/FM receiver module manufactured by Yangjie Technology. It features a highly integrated, low power design with an integrated AM/FM dual-conversion receiver IC, a stereo audio amplifier, and a suite of audio processing functions including bass boosting, treble boosting, and auto gain control. The module supports both radio broadcast and music playback over USB and has an adjustable sensitivity range of -104dBm to -90dBm, making it suitable for use in automotive applications. Additionally, it features an adjustable digital gain control, allowing users to adjust the volume according to their preference.