The RFM64W-433S2 is a small and low cost sub-GHz radio transceiver module manufactured by Hope Microelectronics. It features a highly reliable, low power consumption and a miniaturized design. The module provides efficient communication with 433MHz ISM transmitters and receivers. It has an integrated chip antenna and requires very few external components. The RFM64W-433S2 also features an adjustable power amplifier (PA) and a voltage regulator, as well as built-in hardware support for multiple data transfer protocols, including GFSK, MSK, 2-FSK, OOK and 2-GFSK. The module is suitable for a variety of applications including, but not limited to, industrial automation, smart home automation, home security systems, and wearable electronics.