If you look closely at this image, you will see that this is almost exactly the same as reference design layout for nRF51. So i assume that is nRF51. You can connect it to arduino, but I see very few reasons to do that...
Using arduino here is totally pointless in my opinion. current draw will kill whole power-saving concept. nRF51 only is enough. However, see that they are using some wifi chip also.
Using arduino here is totally pointless in my opinion. current draw will kill whole power-saving concept. nRF51 only is enough. However, see that they are using some wifi chip also.