Features: brand new and high quality Networking Protocol: Support network IPv4/IPv6/SSL.TCP/UDP/HTTP/FTP/MQTT. Bluetooth-compatible Protocol: Meet Bluetooth-compatible V4.2BR / EDR and BLE standards. RF: NZIF Receiver Class-1, Class-2 and Class-3 Transmitter AFH, sensitivity is -97dBm. Modular Interface: UART, SPI SDIO, I2C LED PWM, TV, PWM, I2S, IRGPIO, Capacitor for Touch Sensor, ADC, DACLNA, Preamplifier. WiFi Instructions: The WiFi communication distance is up to 300 meters and the transmission power is 22dBm. WiFi supports FCC/CE-RED/IC/TELEC/KCC/SRRC/NCC. Specifications: Material: Metal Networking Protocol: Support network IPv4/IPv6/SSL.TCP/UDP/HTTP/FTP/MQTT RF: NZIF Receiver Class-1, Class-2 and Class-3 Transmitter AFH, sensitivity is -97dBm Chipset: TTGO Micro32 Flash: QSPI Flash 4MB Extend Fuction: VGA, PS/2 Modular Interface: UART, SPI SDIO, I2C LED PWM, TV, PWM, I2S, IRGPIO, Capacitor for Touch Sensor, ADC, DACLNA, Preamplifier Working Voltage: 2.7V-3.6V Working Current: About 30mA Sleep Current:230uA Working Temperature Range:-40-85 Size: Approx. 67x32 mm/ 2.63x1.26 inches Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Control Module