Waveshare 33507 ESP32-S3 4.2 Inch RLCD Full Reflective Display Development Board Supports Wi-Fi & BLE Dual-Mode Communication Without Battery

1. Features a high-performance Xtensa 32-bit LX7 dual-core processor with a clock speed up to 240MHz
2. Supports 2.4GHz Wi-Fi and Bluetooth 5 (LE) with built-in antennas
3. Includes 512KB SRAM and 384KB ROM, while stack-integrated with 16MB Flash and 8MB PSRAM
4. Features a 4.2-inch full-reflective display with 300 x 400 resolution, offering reflective imaging and eliminating the need for backlighting
5. Equipped with a dual-microphone array enabling audio algorithms like noise reduction and echo cancellation, ideal for precise voice recognition and near-field/far-field voice wake-up applications
6. Onboard PCF85063 RTC real-time clock and SHTC3 temperature/humidity sensor for precise RTC time management and environmental monitoring
7. Integrated 18650 lithium battery holder and RTC backup battery holder (requires rechargeable RTC battery), supporting dual-mode operation: main power supply and independent RTC backup
8. Onboard Micro SD card slot for external storage of images or files
9. Two customizable side buttons (KEY and BOOT) for developing user-defined functions
10. Reserved 2 x 8-row female header (2.54mm pitch) for external expansion

Specifications
1. Display panel: fully reflective screen
2. Display size: 4.2 inches
3. Display resolution: 300 x 400
4. Gray scale levels: 2
5. Communication interface: SPI
6. Display method: fully reflective
7. Driver IC: ST7305
8. Display colors: black, white
9. Size: about 9.25 x 6.91 cm

Packaging list:
- ESP32-S3-RLCD-4.2-EN host x 1
- Acrylic stand x 2
- 8-ohm 2W MX1.25 2PIN speaker (forward) 80mm x 1
- Screwdriver x 1