NOTE4C Devkit

Four-color e-paper. Complete hardware. Open development.

NOTE4C Devkit is a fully assembled 4.2-inch four-color e-paper development device powered by ESP32-S3. Its black, white, red, and yellow display makes it a practical starting point for electronic labels, status boards, photo cards, schedules, and other low-power information displays.

Built for open development

The accompanying open-source reference firmware covers Wi-Fi provisioning, image transfer, and basic four-color display validation. The display, mainboard, battery, enclosure, controls, and core peripherals are already assembled, so you can focus on firmware and product development.

Key specifications

• Display: 4.2-inch four-color e-paper, 400 × 300 pixels
• Colors: Black, white, red, and yellow
• Processor: ESP32-S3, dual-core Xtensa LX7
• Memory: 16 MB Flash and 8 MB PSRAM
• Wireless: 2.4 GHz Wi-Fi and BLE 5.0
• Power: 2,000+ mAh battery with USB Type-C charging and data
• Hardware: Speaker, microphone, physical buttons, status light, magnetic back, and expansion GPIO
• Dimensions: 97 × 97 × 8.75 mm

Development device notes

A full-screen refresh typically takes more than 10 seconds, making NOTE4C Devkit best suited to static or occasionally updated content rather than animation or real-time dashboards. It does not include NOTE4 consumer firmware or official AI voice features.

NOTE4C Devkit is a development device and does not include a commercial product warranty. Hardware manufacturing defects may be eligible for support, subject to assessment and applicable law.