Key features
1.Bluetooth 5.1 compliant single-mode Bluetooth Low Energy protocol stack
  -Up to four peripheral connections and one broadcaster running concurrently
  -Configurable number of connections and connection properties
  -Configurable attribute table size
  -Custom UUID support
  -Link layer supporting LE 1M PHY and LE 2M PHY
  -LL Privacy
  -LE Data Packet Length Extension
  -ATT and SM protocols
  -L2CAP with LE Credit-based Flow Control
  -LE Secure Connections pairing model
  -GATT and GAP APIs
  -GATT Client and Server
  -Configurable ATT MTU
2.Complementary nRF5 SDK including Bluetooth profiles and example applications
3.Master boot record for over-the-air device firmware update
  -SoftDevice, application, and bootloader can be updated separately
4.Thread-safe supervisor-call based API
5.Asynchronous, event-driven behavior
6.No RTOS dependency
   -Any RTOS can be used
8.No link-time dependencies
   -Standard ARM® Cortex®- M4 project configuration for application development
9.Support for concurrent and non-concurrent multiprotocol operation
  -Concurrent with the Bluetooth stack using Radio Timeslot API
  -Alternate protocol stack in application space
10.Support for control of external power amplifiers and low noise amplifiers

 

Applications
1.Sports and fitness devices
  -Sports watches
  -Bike computers
  -Fitness machines
2.Personal area networks
  -Health and fitness sensor and monitoring devices
  -Medical devices
  -Key fobs and wrist watches
3.Home automation
4.AirFuel wireless charging
5.Remote control toys
6.Computer peripherals and I/O devices
  -Mice
  -Keyboards
  -Multi-touch trackpads
7.Interactive entertainment devices
  -Remote controls
  -Gaming controllers