Application scenario: Home smart device image transmission, Smart agriculture, Wireless monitoring, QR wireless recognition, Wireless positioning system signal, And other IoT applications.     Wi-Fi: 802.11b/g/n/e/i     Bluetooth: Bluetooth 4.2BR/EDR and BLE standards     Support interface (2Mbps): UART, SPI, I2C, PWM     Support TF card: maximum support 4G     IO port: 9     Serial port speed: the default 115200bps     Spectrum range: 2400 ~2483.5MHz     Antenna form: onboard PCB antenna, gain 2dBi     Image output format: JPEG (only OV2640 support), BMP, GRAYSCALE     Packaging method: DIP-16     Transmit power: 802.11b: 17 +/- 2dBm (@11Mbps)     802.11g: 14 +/- 2dBm (@54Mbps)     802.11n: 13 +/- 2dBm (@MCS7)     Receiving sensitivity: CCK, 1Mbps: -90dBm     CCK, 11Mbps: -85dBm     6Mbps(1/2BPSK): -88dBm     54Mbps(3/464-QAM): -70dBm     MCS7 (65Mbps, 72.2Mbps): -67dBm     Power consumption: turn off the flash: 180mA@5V     Turn on the flash and adjust the brightness to maximum: 310mA@5V     Deep-sleep: The lowest powerconsumption can reach 6mA@5V     Moderm-sleep: the lowest can reach 20mA@5V     Light-sleep: the lowest can reach 6.7mA@5V     Security: WPA/WPA2/WPA2-Enterprise/WPS     Working temperature: -20 Celsius~70 Celsius     Storage environment: -40 Celsius~ 125 Celsius, less than 90%RH     Colour: black     Material: PCB+metal          Package Contents:     3 * ESP32-CAM-MB Development Board          Only the above package content, other products are not included.     Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.