This app controls the well known universal relayboards ETH-RLY2 and ETH-RLY16.
I have used this to control a TV lift and a light source as shown in the youtube video.
These boards are available in most countries. You can connect as many boards as you want with this app.
Here is the video link of this app in operation:
http://www.youtube.com/watch?v=D16_nM2q-MQ
This app is available for the iPhone, ipad and ipod touch,
ios versions 4.3 and higher.