A convenient add-on companion hardware for the RFBee is the Seeed Studio "Relay Shield" board by Seeed Studio.
This board comes with four on-board relays and screw posts for installation. This board features a socket to accommodate a Seeed Studio "RF Bee" module
and makes for exciting possibilities to switch electricity, and accomplish wireless control interaction between nodes. The board also adds convenient power supply conversion and breakout pins for unused RFBee IO module pins. We supply the Relay Shield here