• Outstanding RF performance: Powerful ESP32-C3 SoC and U.FL antenna provided that supports WiFi/Bluetooth connection over 100m.
  • Thumb-size Design: 21 x 17.5mm overall dimension, portable and lightweight.
  • Low power consumption: Lowest as 44 μA (deep sleep mode), with 4 working modes available.
  • Onboard battery charge IC: Supports battery charging, great for various wearable scenarios and wireless IoT applications.
  • Ready for productization: Single-sided components design, easily integrated into other boards and Seeed provides Fusion Service for rapid production.


  • ESP32-C3 SoC
  • RISC-V single-core 32-bit chip processor with a four-stage pipeline that operates at up to 160 MHz


  • Complete 2.4GHz Wi-Fi subsystem
  • Bluetooth 5.0/ Bluetooth mesh

On-chip Memory:

  • 4MB Flash
  • 400KB SRAM


  • 1x UART, 1x IIC, 1x IIS, 1x SPI,11x GPIO(PWM), 4x ADC
  • 1x Reset button, 1x Boot button


  • 21 x 17.5mm


  • Circuit operating voltage:3.3V@200mA
  • Charging current: 50mA/100mA
  • Input voltage (VIN): 5V

Deep Sleep Power Consumption:

  • Deep Sleep Model: >44 μA

Wi-Fi Enabled Power Consumption:

  • Active Model: <75 mA
  • Modem-sleep Model: <25 mA
  • Light-sleep Model: <4 mA

BLE Enabled Power Consumption:

  • Modem-sleep Model: <27 mA
  • Light-sleep Model: <10 mA


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