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The SonoffRFR2 is a Sonoff version with an integrated 433MHz RF receiver module. This product can be used in conjunction with an RF remote control, which allows you to control appliances indoors.
This is a fantastic find for SFE. A small, high-quality, quad-band, standard SMA terminated, cellular antenna.
Need range? The 2.4GHz Large Duck Antenna 5dBi with Reverse Polarized - SMA RF connector is perfect for you.