The body interaction vibrator development board can communicate with any other body interaction board with the on-board RFM12b module. This module is a transceiver: it can send out data and receive data. This can be used to control a vibrator or sync to vibrators. The code at Github (the "p5" script enables this feature).

This works well without antenna when both board are in a short distance. If you want to enhance the range you should add an antenna.

The antenna is just a short wire. Solder the wire to the pad "ANT". The length of the wire is very important. The RFM12b is available in 2 frequencies: 915MHz (US and Australia only) and 868 MHZ. The length of the wire for 915 modules is 82mm. For 868 modules the length is 86mm. Check out the Jeelab site for more information.