RF type is Transceiver; Bluetooth® Smart Ready 4.x Dual Mode from the Evaluation board.As you can see, this RF Board comes from the well-known PAN1326 series of products.
ENW89819AYKF Features
Transceiver; Bluetooth® Smart Ready 4.x Dual Mode Type
ENW89819AYKF Applications
There are a lot of Panasonic Electronic Components ENW89819AYKF RF Boards applications.