I'm tempted to see what's actually in it...? Just a flashing LED? 
At least 'proper' tuning boxes can increase fuelling, admittedly not in the right way, but I can't see how you could alter anything at all through OBD for £7 posted from Hong Kong...

At least 'proper' tuning boxes can increase fuelling, admittedly not in the right way, but I can't see how you could alter anything at all through OBD for £7 posted from Hong Kong...