I work at Omron that manufacture relay for almost 2 years. What i can say about a seal relay is that it is a great relay that you actually could use submerge under liquid. if you only have the relay then you need a couple more thing to make it work,
1)a Transistor/Optocoupler would be great
2) a signal Diode,1n4001
3 A power supply that can supply enough volt to activate the relay coil.
wires / board
and last but not least a box preferably a plastic box big enough to contain it all