Features:
Outstanding RF performance
Powerful ESP32-C3 SoC and U.FL antenna provided that supports WiFi/Bluetooth connection over 100m.
Rich Interface
There are 11 digital I/O that can be used as PWM pins and 4 analog i/o that can be used as ADC pins.  It supports UART, IIC, and SPI serial  communication ports, also including IIS (Internet Information Services).
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.
 
Product Description:
Seeed Studio XIAO ESP32C3 has equipped a highly-integrated ESP32-C3 chip, built around a 32-bit RISC-V chip processor with a four-stage pipeline that operates at up to 160 MHz.
The board equips highly-integrated ESP32-C3 SoC.   The chip has been installed with a complete 2.4GHz Wi-Fi subsystem which means it supports Station mode, SoftAP mode, SoftAP & Station mode, and promiscuous mode for multiple Wi-Fi applications.   It works under an ultra-low power state, also supporting features of Bluetooth 5 and Bluetooth mesh.   There are 400 KB SRAM & 4 MB Flash on the chip, allowing for more programming space, and bringing more possibilities to the IoT control scenarios.
 
Application:
-Internet of Things
-Wearable devices
-Health monitoring
-Education
-Low-Power(LP) networking
-Rapid prototyping