The AtomS3U is a USB flash drive-type ESP32-S3 multi-functional development board. It uses the ESP32S3 main control chip, a dual-core Xtensa LX7 processor with a 240MHz clock speed, and built-in WiFi. Its interfaces include a USB-A port (supports OTG), one Grove port, and a 6-pin @ 2.54mm female header (including four GPIO pins). Peripherals include one PDM microphone, one infrared LED, and one programmable RGB-LED. This product can be used in IoT human-computer interaction, voice input/recognition (STT), IO control, and other scenarios. Features: ESP32-S3FN8@240MHz, Xtensa LX7, WIFI, OTG/CDC Integrated programmable RGB LED and buttons Built-in infrared emitter Expandable pins and GROVE interface Development platforms: for MicroPython, for Arduino, for UlFlow Specifications: MCU: ESP32-S3FN8@Xtensa LX7. WIFI, OTG, CDC Microphone: SPM1423 Interface: USB-A Grove Interface: PORTA 2.54-6P Interface: GND/VIN 5V/G14/G17/G42/G40 Microphone Sensitivity: 94dB SPL@1KHz, Typical: -22dBFS Microphone Signal-to-Noise Ratio: 94dB SPL@1KHz, A-weighted, Typical: 61.4dB Supported Input Audio Frequency: 100Hz~10KHZ Supported PDM Clock Frequency: 1.0~3.25MHz RGB Lights: WS2812 Color: White Material: plastic Package Contents: 1 * Development Board 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.