V4 Upgrade Details:

1. Added a shield cover to the Si4732 receiver section to suppress electromagnetic interference; added ESD protection devices at the antenna input for chip safety.

2. The Hi-Z circuit has been moved to the front end of the antenna path and now uses a more stable VCC_RADIO power supply to preserve signal resonance and reduce noise.

3. New functionality allowing the use of wired headphones as an FM antenna (works best in areas with strong FM signals and when using relatively long headphone cables).

4. Left and right audio channels have been swapped; simultaneously readjusted amplifier and speaker parameters for improved sound quality.

5. Upgraded to more expensive and superior components: a sturdier, more durable telescopic antenna and knobs with better, non-slip grip.

Features:

1.Utilizes an ESP32-S3 main controller + SI4732 DSP chip. Supports ALL Band reception, LSB, USB, AM, FM modes, and features AGC/ATT functionality.

2.Equipped with a 1.9-inch high-definition IPS color screen, supports adjustable backlight brightness, and displays battery level.

3.Built-in 1W power cavity speaker delivering loud and clear audio quality.

4.Supports upgrading to the latest firmware. Pre-installed firmware version is at least VER.2.3.1 (Due to frequent firmware updates, please check the user manual and update to the latest firmware upon receipt for the best experience).

5.Built-in headphone amplifier circuit ensures loud volume when using headphones.

6.Built-in Hi-Z circuit enhances weak signal resolution.

7.Insists on using genuine ESP32 modules (ESP32-S3-WROOM-1-N16R8), unlike counterfeit modules used in other clone models.

Specifications:

Brand: AMNVOLT

Model (Hardware Version): V4

Case Material: Your choice of Metal or ABS Plastic injection molding.

Main Controller: ESP-32-S3

Operating Modes: FM / AM / LSB / USB (Note: Does not support Air Band)

Reception Bands: HF / SW / MW / VHF

Frequency Range: LW, MW, SW (150kHz - 30MHz), VHF (64-108MHz)

Screen: 1.9-inch, 170*320 resolution

Screen Brightness: 32~255 levels, adjustable

Charging Port: TYPE-C (Cannot use fast chargers for charging)

Audio Jack: 3.5mm 3-pin stereo

Antenna Connector: SMA-KE (Female, Inner Hole)

Battery Capacity: 800mAh

Package List:

1 x AMNVOLT V4 Radio

2 x Antennas (Telescopic Whip Antenna / Rotatable Loop Antenna)

Please note when purchasing：

1. Headphones are NOT included in the package. The headphones shown in pictures are for demonstrating the FM antenna function only. Please prepare your own headphones!

2. If you select the metal case version, please be aware that the aluminum material provides some shielding against wireless electromagnetic signals. While this improves reception against interference, it can also weaken the Wi-Fi connection strength. Please consider this before purchasing.