Like the PlayPad Pro, the PlayPad controller utilizes the new HID protocol, Nyko's Playground app and works with any Bluetooth-enabled device running Android 3.0 or higher.

ENGADGET: Nyko Free Fighter joystick brings flexible controls, arcade flair to the PS3

It appears that the Texas Instruments controller chosen for the e-paper watch does not support the wireless protocol's low energy profile, something Pebble lists as one of the specs on its site (we've reached out to the company for clarification on this matter).

ENGADGET