Features: It consists of a keyes ESP32-IO expansion board and a keyes ESP32 Core board Development board composition, when using, only need to input for DC 7-12V voltage on the black for DC for head It can supply power to the keyes ESP32 Core board. And the expansion board also comes with 1 dial codeSwitch, used to control the power switch. Developers can connect peripherals according to their needs. When using the development board for development and debugging, the standard headers on both sides can make your operation easier and convenient. ESP-WROOM-32 module is the industry's leading integrated WiH + Bluetooth-compatible solution, Less than 10 external components, it integrates antenna switch, radio frequency balun, power amplifier Converters, low-noise amplifiers, filters and power management modules. At the same for time, it also integratesTSMC low-power 40nm technology, power performance and radio frequency performance, safe and reliable, easy to expand Expand to various applications. Specifications: Microcontroller: ESP-WROOM-32 module USB to serial port chip: CP2102-GMR Power supply voltage: for DC 7-12V Working current: 60mA Maximum power: 0.3W Working temperature: -25C to +65C WiFi mode: Station/SoftAP/SoftAP+Station/P2P WiFi protocol: 802.11 b/g/n/e/i (802.11n, speed up to 150Mbps WiFi frequency range: 2.4 GHz ~ 2.5 GHz Bluetooth-compatible protocol: for comply with Bluetooth-Compatible V4.2BR/EDR and BLE standards Size:approx 67x50x19mm/ Weight: 32.8g Note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment Package includes: 1 x Expansion board