Features: brand new and high quality Durable material: This product is made of high-quality material, durable, long service time, firm and stable in use. The complete solution takes up the least printed circuit board area. This board is used with 2.4GHz dual-mode WiFi and wireless chips using 40nm TSMC low-power technology. The best power and RF characteristics are safe, reliable and scalable for various applications. Meticulous workmanship: The meticulous design, perfect in workmanship, durable and long service life. Compact and portable: being so mini and light-weight, this product does not take much space and can be easily taken away. Specifications: Working voltage: 5V SPI FLASH: 32MBIT by default Serial port rate: 115200BPS Frequency range: 2412-2484MHZ Bluetooth protocol: Bluetooth 4.2BR/EDR and BLE standards WF1 protocol: 802.11B/G/N Antenna form: on-board PCB antenna, gain 2DBI Support connection: UART, SPI, SDIO, I2C, PWM, I2S, IR, ADC, DAC Size: approx. 51.2x25.6mm Package Includes: 1 x ESP32-NROOM-32 Development Board note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!