The EFR32FG1 SLWRB4251A radio board plugs into the mainboard provided with the EFR32FG Starter Kits. The radio board can also be used as a reference design for matching networks of the RF interfaces. The SLWRB4251A radio board supports dual-band operation with sub-GHz operation in the US FCC 490 MHz band with an external whip antenna and 2.4 GHz operation at the 2400-2483.5 MHz band with the on-board printed antenna. The matching networks are optimized to +19.5 dBm output power.
This radio board cannot be used stand-alone and requires a wireless mainboard which can be purchased separately.