The nRF51 Series is a family of multiprotocol, System on Chip (SoC) devices for ultra-low power wireless applications. The nRF51 Series SoCs support a range of protocol stacks including Bluetooth® Smart, ANT™, and proprietary 2.4 GHz protocols such as Gazell and are on-air-compatible with our existing nRF24L products. In addition, we offer our own protocol stack solutions in the form of SoftDevices, which are binary file downloads that you can upload onto nRF51 Series SoCs.