The HY-40R204I Wireless Module RoHS is a small, cost-efficient module manufactured by Shengrun. It operates at 2.4 GHz, operates on 450/1000mW transmission power and supports 6mA operating current. It features integrated baseband, integrated protocol stack, and small size. It can be used for building various wireless networks, such as wireless sensing, home automation, and residential safety. It is RoHS compliant, which means it contains no hazardous materials that can harm the environment.