The Si4438-B1C-FMR is a radio transceiver IC manufactured by Silicon Labs. It is packaged in a QFN-20 RoHS package and operates in the 868-915 MHz frequency band. It provides up to 19dBm of output power for long range wireless communication. It is designed for applications such as wireless metering, building automation, and consumer electronics. It also supports wireless connection of remote sensors and RF transmission of digital data. The Si4438-B1C-FMR includes a receiver, data rate of up to 150kbps, and offers multi-channel operation for fast signal acquisition. It also has an integrated 8-bit MCU with up to 256 bytes of RAM along with the integrated radio core. Finally, it is designed to consume low power, making it an ideal choice for battery-powered systems.