JY MCU Bluetooth

These devices come as four-pin or six-pin. I just want a wireless serial display. I have a four-pin in service and it is fine. I now have a six pin board.

What’s the story with the key and state contacts? Do I need them for my purposes?

Read the comments of this post, somebody explains what the key/state pins are used for. http://diydrones.com/profiles/blogs/setup-bluetooth-jy-mcu-bt-board-v1-2

Thanks. I think I can live without those pins!