V4 Update Content: 1. A shield has been added to the Si4732 receiver to suppress electromagnetic interference; an ESD device has been added to the antenna input to protect the chip. 2. The Hi-Z circuit has been moved to the front of the antenna path and uses the more stable VCC_RADIO power supply to preserve signal resonance and reduce noise. 3. The ability to use wired headphones as an FM antenna has been added (this requires use in an environment with a strong FM signal and a long headphone cable for optimal performance). 4. The left and right audio channels have been swapped; the amplifier and speaker parameters have also been retuned to improve sound quality. Controller: ESP-32-S3 Operating Modes: FM/AM/LSB/USB (Note: Airband is not supported) Receiving Bands: HF/SW/MW/VHF Frequency Range: LW, MW, SW (150kHz - 30MHz), VHF (64-108MHz) Screen: 1.9-inch, 170 * 320 resolution Screen Brightness: Adjustable from 32 to 255 levels Charging Port: TYPE-C (Cannot be charged with a fast charger) Audio Port: 3.5mm three-way stereo Antenna Port: SMA-KE (female) Battery Capacity: 800mAh Color: Black Material: ABS Package Contents: 1 * SI4732 Radio 1 * Circular Antenna