The RFM50-869S is a radio frequency module manufactured by Hope Microelectronics. It is a single-chip solution for wireless communication in the 869 MHz ISM and SRD band. The module is designed to provide low power, long range, and reliable wireless communication link between two or more devices. Features of the module include a transmission power of up to 25 dBm, a pair of amplifier stages, data rate up to 576 Kbps, adjustable RF output power, and a wide range of modulation and coding schemes, as well as enhanced digital I/O and SPI interfaces. The module is suitable for applications such as remote sensing and control, industrial automation, alarm and security systems, and home automation.