Features: This module chip is ESP32, which features scalability and adaptability. Two CPU cores can be controlled separately. Clock frequency adjustment from 80MHz to 240MHz, and supports RTOS. It is a universal Wifi+BT+BLE MCU module. The Nodemcu-32s module integrates traditional Bluetooth-compatible, low-power Bluetooth-compatible, and WiFi. WiFi supports wide communication connections as well as direct internet connection via routers; Bluetooth-compatible allows users to connect to their phones or broadcast BLE Beacon for signal detection. The module supports a data transfer rate of up to 150 Mbps and a power output of 20dBm, enabling large-scale wireless communication. The operating system for ESP32 is FreeRTOS with LwIP, and TLS1.2 with hardware acceleration function is also built-in. Specifications: Node: mcu-32s Chip: ESP32 2CPU Frequency: 80Mhz-240Mhz Built-in: CH340 USB Serial Port LED Modules: ESP-32S/ESP-WROOM-32E/ESP WROOM-32UE/ESP WROVER-E/ESP WROVER-IE Function: 36 GPIOs, each can be configured as PWM, I2C Size: approx. 4.8x2.55cm/1.89x1in Note: Due to different monitors and lighting effects, the actual color of the item may differ slightly from the color shown in the pictures. Thank you! Please allow 1-2 cm measurement deviation due to manual measurement. Package includes: 1pc ESP-32S/ESP-WROOM32E/ESP WROOM32UE/ESP WROVER-E/ESP WROVER-IE Development Board (Optional)