Silicon Labs FG25-RB4272A Development Tool is an excellent starting point for getting familiar with the EFR32 Wireless Gecko Wireless System-on-Chip. The Silicon Labs FG25-RB4272A is a plug-in board for the BRD4001A Wireless Starter Kit Mainboard and the BRD4002A Wireless Pro Kit Mainboard. The board is a complete reference design for the EFR32FG25 Wireless SoC, with matching networks for 16dBm output power and an SMA connector for the 470MHz band.