Features:1. Open-source, interactive, programmable, low cost, simple, smart.2. Advanced API for hardware IO, which can dramatically reduce the redundant work for configuring and manipulating hardware.3. Nodejs style network API.4. Event-driven API for network applications, which facilitates developers writing code running on a 5mm*5mm sized MCU in Nodejs style.5. Greatly speed up your IOT application developing process.6. Lowest cost WI-FI.7. We provide the best platform for IOT application development at the lowest cost.Specification:Item Type: Wifi ModuleSize: Approx. 5.7 x 3cm / 2.2 x 1.2inPackage List:1 x Wifi ModuleNote:1. Please allow slight error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard..3. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.