ESP32-S3 4.2-inch RLCD Development Board

This is a 4.2-inch reflective LCD (RLCD) development board equipped with ESP32-S3, provided by Waveshare. It features a 300x400 resolution black and white reflective LCD for ultra-low power consumption and excellent visibility, similar to e-paper. It supports AI voice with a dual microphone array and includes an onboard speaker. It integrates an RTC chip, a temperature and humidity sensor, and a microSD slot. With Wi-Fi/Bluetooth dual-mode support, it is ideal for smart displays and IoT devices. Specifications Chip ESP32-S3 Module ESP32-S3-WROOM-1 Flash 16MB PSRAM 8MB Display Size 4.2inch Display Type RLCD (Reflective LCD) Resolution 300×400 Speaker Yes Speaker Details Onboard speaker Microphone Type Dual Microphone Details Dual microphone array for AI voice interaction Audio Codec ES7210 ADC, ES8311 DAC Communication Wi-Fi 2.4GHz, Bluetooth 5 LE Battery Yes Battery Details Lithium battery (sold separately) Sensors RTC PCF85063, SHTC3 Temperature & Humidity Sensor USB Type-C Number of Buttons 1 Documents Official Wiki Official Documentation CNX Software Review xiaozhi-esp32 Repository Reference Links Waveshare Official: https://www.waveshare.com/esp32-s3-rlcd-4.2.htm AliExpress: https://www.aliexpress.com/wholesale?SearchText=ESP32-S3-RLCD-4.2 eBay: https://www.ebay.com/itm/267535492754 NotesUnique RLCD (Reflective LCD) technology for ultra-low power. E-paper-like display with faster refresh. Dual microphone array with ES7210/ES8311 audio codecs. RTC and temperature/humidity sensor included. Pricing (2026-05-05): Source: ¥4860 JPY (Old data), retail = source × 2 = ¥9720