Feature: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.Specification:Item Type: Development BoardMaterial: PCBPurpose: Suitable for learning and development of college students, engineers, technicians, factories, electronic enthusiasts, etc.Microcontroller: ESP-WROOM-32 modulePower Supply Voltage: 7-12VWorking Current: 60mAMaximum Power: 0.3WWorking Temperature: -25-65WiFi Mode: Station/SoftAP/SoftAP+Station/P2PWiFi Protocol: 802.11 b/g/n/e/i (802.11n, speed up to 150 Mbps)WiFi Frequency Range: 2.4 GHz -2.5 GHzBluetooth Protocol: Compliant with Bluetooth v4.2 BR/EDR and BLE standardsPackage List:1 x Module