https://www.silabs.com/wireless/bluetooth/efr32bg1-series-1-modules/device.bgm111a256?tab=softwareandtools
BGM111A256 Bluetooth Low Energy Module - Silicon Labs - Silicon Labs
The BGM111A256 Bluetooth Low Energy Module integrates our complete Bluetooth software stack and antenna to provide a complete, pre-certified BLE solution.
bluetooth low energymodulesiliconlabs