The RFM43B-433-S1 is a radio frequency module from Hope Microelectronics. It is designed for use in data communications applications such as remote control, home automation, industrial automation, and building automation systems. The module operates at a frequency of 433 MHz and offers a low power consumption and high transmission data rate, up to 125 Kbps. It has a wide temperature operating range (-40°C - +85°C) and provides high sensitivity and good anti-interference performance. The RFM43B-433-S1 is also compliant with e-mark Compliance, FCC, and IC regulations. The RF module is available in a quarter-brick form factor and is RoHS compliant.