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 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 * telescopic antenna (The style of the antenna is random, no specified style is accepted) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.