It consists of a keyes ESP32-IO expansion board and a keyes ESP32 Core board development board composition, when using, only need to input DC 7-12V voltage on the black DC head, then it can supply to the keyes ESP32 Core board.And the expansion board also comes with 1 dial code switch, used to control the switch. Developers can 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, Clean and convenient.ESP-WROOM-32 module is the industry's leading integrated WiH + Bluetooth solution, Less than 10 external components, it integrates antenna switch, radio frequency balun, amplifier, Converters, low-noise amplifiers, filters and management modules.At the time, it also integrates TSMC low- 40nm technology, performance and radio frequency performance, safe and reliable, easy to expand to various applications.Microcontroller: ESP-WROOM-32 moduleUSB to serial port chip: CP2102-GMR supply voltage: DC 7-12VWorking current: 60mAMaximum : 0.3WWorking temperature: -25C to +65CWiFi mode: Station/SoftAP/SoftAP+Station/P2PWiFi protocol: 802.11 b/g/e/i (802.11n, speed up to 150MbpsWiFi frequency range: 2.4 GHz ~ 2.5 GHzBluetooth protocol: comply with Bluetooth V4.2BR/EDR and standardsSize: 67 x 50 x 19mmWeight: 32.8gType: Voltage Regulatorcolor:Random color (cannot specified color)Material:plasticPackage Contents:1 x ESP32 Core BoardOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.