Logic voltage first, then pins, then the wireless it really has · review
GERUI ESP32-S3-DevKitC-1 with WROOM-1-N16R8 module review
An ESP32-S3 development board on the WROOM-1-N16R8 module, with Wi-Fi, Bluetooth 5 LE, 45 programmable GPIO and external PSRAM, whose listing names neither its logic voltage, its USB connector nor a programming environment.
The bottom line A capable chip described through a poor translation. The radio, pin and memory figures are there; the voltage, connector and toolchain a first-time user needs are not.
The GERUI ESP32-S3 listing, bullet by bullet
Five bullets: 2.4 GHz Wi-Fi with 40 MHz bandwidth and Bluetooth 5 LE with Mesh; 45 programmable GPIO and interfaces including SPI, I2C, PWM, ADC, UART, SD/MMC and TWAI; an ultra-low-power coprocessor, up to 240 MHz and 512 KB SRAM with low-power modes; octal flash, 8 M off-chip PSRAM and 2 Mbps PHY; and uses, the last sentence in English about station mode.
A translation to read through
“Group policy objects” means GPIO. The second bullet was machine-translated, and the figure — 45 — is clear once the term is recognised. The page reports it as GPIO because nothing else in a microcontroller bullet could be meant.
Memory on the S3 module
The title’s WROOM-1-N16R8 names the module variant, and the fourth bullet describes 8 M of PSRAM. External PSRAM is what lets an ESP32-S3 buffer images or audio, and it is the reason to choose this variant.
Voltage and toolchain, both absent
Logic voltage decides whether a sensor can be wired directly, and the programming environment decides the first evening’s work. Neither is on the GERUI page.
Availability
At the last look-up, the German, French and Spanish Amazon stores were asking 9 € to 12 €.
It is sold in the British Amazon store as well, in its own currency, which the euro figures above leave out on purpose.
The asking price on the Italian Amazon store ran past 1.6× the lowest country’s. A gap that size points to goods shipped in from abroad rather than a local seller, so that offer is left out of the figures above.
The American Amazon store returned no entry, so the buy button there opens a search rather than a missing page.
Every figure here is Keepa’s reading on the date this page was last updated. Stock and prices can change at any time.
Prices quoted in this text were read on 15 September 2026. The live price is at the top of the page.
Where it earns its place, and where it falls short
Strengths
Wi-Fi and Bluetooth 5 LE with Mesh on one board
45 programmable GPIO and a wide set of peripheral controllers
External PSRAM for memory-hungry projects, and several low-power modes
Compromises
No logic voltage, USB connector or programming environment published
Machine-translated bullets: GPIO appears as “group policy objects” and I2C as “125l2C”
The fifth bullet switches into English mid-sentence
Specifications
Processor
ESP32-S3 at up to 240 MHz, with an ultra-low-power coprocessor, third bullet
Logic voltage
Absent from the listing
Memory
512 KB SRAM (TCM) and 8 M off-chip PSRAM, with octal flash support; the title names the WROOM-1-N16R8 module, third and fourth bullets
Pin functions
45 programmable GPIO with SPI, I2C, PWM, ADC, UART, SD/MMC host and TWAI controllers, second bullet
Wireless
2.4 GHz Wi-Fi 802.11 b/g/n with 40 MHz bandwidth, Bluetooth 5 (LE) and Bluetooth Mesh, first bullet
USB connector
Absent from the listing text — the product photograph shows two USB-C ports
Programming environment
Absent from the listing
Amazon reference
B0FYFF8CB2 (same reference on 5 Amazon marketplaces)
EAN
0744243975694
Questions makers ask before buying
How many GPIO does the GERUI ESP32-S3 board have?
The second bullet gives 45 programmable GPIO, machine-translated as “group policy objects”, together with SPI, I2C, PWM, ADC, UART, SD/MMC and TWAI interfaces.
Which radios are on this ESP32-S3 board?
The first bullet lists 2.4 GHz Wi-Fi 802.11 b/g/n and Bluetooth 5 Low Energy with Bluetooth Mesh support.
Renesas RA4M1 (Arm Cortex-M4) with ESP32-S3 · Wi-Fi and Bluetooth 5.0 · USB-C · CAN and Qwiic · 12-bit DAC and op-amp · 12 × 8 LED matrix · Arduino IDE
An Arduino UNO R4 WiFi pairing a Renesas RA4M1 Arm Cortex-M4 microcontroller with an ESP32-S3 radio chip, with USB-C, CAN, a Qwiic connector, a 12-bit DAC and a 12 × 8 LED matrix on board.
Best for: A learner or maker who wants the Arduino ecosystem with Wi-Fi, and on-board feedback from the LED matrix.
3 boards · dual-core 32-bit, up to 240 MHz · Wi-Fi 2.4 GHz and Bluetooth · GPIO, SPI, I2C · USB-C · Arduino IDE compatible · OTA firmware updates
A pack of three ESP-32 development boards with dual-core 32-bit processors up to 240 MHz, Wi-Fi and Bluetooth, USB-C and Arduino IDE compatibility, whose listing gives no memory or pin counts.
Best for: A beginner or classroom starting with ESP32 in the Arduino IDE, with spare boards for experiments.
ESP32-S3 · CC1101 named in the title · external antenna · open-source hardware · documentation on GitHub and wiki only · no memory, pins, voltage or radios detailed
An ESP32-S3 device from LILYGO with a CC1101 named in its title and an external antenna, sold as open-source hardware whose five bullets contain links to documentation rather than specifications.
Best for: An experienced maker who already knows the T-Embed platform and will read the GitHub repository before buying.
