The HLK-TX-PCB-B with Antennas ROHS from HI-LINK is an electromagnetic devices designed to transmit and receive radio signals. It is a two layer PCB board which is used in Internet of Things (IoT) systems and low power wireless applications. It is commonly used for communication between two or more endpoints in a wireless systems. Its features include low power consumption, high efficiency, excellent RF performance, and a smaller size. It is RoHS compliant, so it meets the European Union's environmental standards. This device is suitable for a wide range of applications, such as environmental monitoring, home automation, healthcare, and industrial sensing.