1、The expansion board also comes with a dial switch to control the power switch. 2、Developers can connect peripherals according to their needs, which is convenient and quick. 3、When using the development board for development and debugging, the standard headers on both sides can make your operate more concise and convenient. 4、It is suitable for learning and development of college students, engineers, technicians, factory workers, electronic enthusiasts, etc. 5、Made of PCB material, which makes it sturdy and have high reliability. Item Type: Development Board Material: PCB Purpose: Suitable for learning and development of college students, engineers, technicians, factories, electronic enthusiasts, etc. Microcontroller: ESP-WROOM-32 module Power Supply Voltage: 7-12V Working Current: 60mA Maximum Power: 0.3W Working Temperature: -25-65℃ WiFi Mode: Station/SoftAP/SoftAP+Station/P2P WiFi Protocol: 802.11 b/g/n/e/i (802.11n, speed up to 150 Mbps) WiFi Frequency Range: 2.4 GHz -2.5 GHz Bluetooth Protocol: Compliant with Bluetooth v4.2 BR/EDR and BLE standards 1 x Module