EFR32xG21B 2.4GHz 10dBm Radio Board w/Secure Vault

Silicon Labs EFR32xG21B 2.4GHz 10dBm Radio Boards with Secure Vault features the EFR32xG21 Wireless Gecko Wireless SoC. The Radio Board plugs in directly to the Wireless Starter Kit Mainboard, which features several tools for easy evaluation and development of wireless applications. Silicon Labs EFR32xG21B Radio Board offers an inverted-F PCB antenna (2.4GHz band) and two red and green color LEDs. There are two different +10 dBm Radio Boards.  One is for the regular (SLWBR4181B) EFR32xG21A 2.4GHz SoC, and one for the (SLWRB4181C) EFR32xG21B 2.4GHz with a secure vault.