The ESP-01M with WIFI Modules Module RoHS from Ai-Thinker is a low-cost, ultra-small-sized Wi-Fi module. It is based on the ESP8266ex, a low-power System on Chip (SoC) with full TCP/IP protocol stack. This Wi-Fi module can easily be integrated into a wide range of IoT applications. The module has an on-board antenna which supports both 2.4GHz and 5GHz Wi-Fi frequency bands. It also supports the IEEE 802.11 b/g/n standards and provides a WPA/WPA2 security protocol. The ESP-01M also offers an impressive operating range of up to 300 meters in open space. With its energy-saving design, this module is ideal for battery-powered IoT applications. It is also RoHS compliant, making it safe for use in various environments.