Specifications

8.Pin definition：
9.Design notes：
In order to better SNR, please pay attention to the hardware design of
PA, DC booster, DC/DC circuit and the module power circuit to avoid
influencing module.
10.Note：
A．The signal strength is depending on the environment of Bluetooth
application, such as wood and metal will block the transmission signal to get
the shorter transmission distance.
B．Because of metal will block the signal transmission, it is recommend
not to using the metal housing.
C．PCB layout guideline: no any copper existed in the an tenna area of the
module is the PCB antenna, the metal will weaken the function of the
antenna when the antenna module to the module board, following