The shield comes with a SMA connector for use with an external antenna. (Requires soldering)
New Features in BLE Shield Version 2.1:
- Reset button moved to the side, so you can use it while stacked with another shield.
- nRF8001 SPI pins can be set to either Pins 11-13 on the side or ICSP, this allows other Arduino compatible boards with no ICSP header such as FRDM-KL05 board, RedBoard and so on to interface with the nRF8001 BLE chip
- Flexible REQN and RDYN pins can be set to pin 2 or 10
- Shorter PCB, which lets it fit on a Arduino Yun.