The ESP-01S with WIFI Modules Module RoHS is an ultra-small WiFi module manufactured by Ai-Thinker. This module is based on the ESP8266EX processor and has an in-built Wi-Fi antenna. It offers very high output power of up to 19.5dBm, making it ideal for applications that require a Wi-Fi connection from a small space. Additionally, the module supports multiple protocols, allowing it to be used in different applications. It is compliant with the RoHS specification, which means it is environmentally friendly and does not contain any hazardous substances. It is also FCC Certified, so it can be used in many different countries. This module is highly recommended for applications such as smart home applications, health care, and retail integrations, among others.