The WS1850S with QFN-32 RF Chips ROHS is a custom made chip manufactured by Wisesun that is suitable for narrow-band radio frequency (RF) applications. It contains an on-chip PA module and integrated LNA. The chip has 1 to 8 channels with a power output of up to 0.5 watt. It also has a receive sensitivity of up to -123dBm and a data rate of up to 250kbps. Additionally, the RF chip comes with integrated frequency synthesis technology to provide a highly accurate and stable data link. The chip is RoHS compliant and provides a low cost solution for applications such as IoT nodes, alarms, sensors, asset tracking, remote control, and M2M systems.