524aa351_BlueSMiRF___learn_sparkfun_com__Input__Output__Power_
[Pin Label] CTS-I [Pin Function] Clear to send [Description] CTS is another serial flow control signal. Like RTS, it's not required for most, simple serial interfaces. [Input, Output, Power?] 
Input
O u t p u t
I n p u t
P o w e r I n
Using the BlueSMiRF - learn.sparkfun.com
Input, Output, Power?